{"id":532623,"date":"2026-07-17T16:15:35","date_gmt":"2026-07-17T20:15:35","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/?p=532623"},"modified":"2026-07-17T16:15:35","modified_gmt":"2026-07-17T20:15:35","slug":"2020-audi-a6-pcm-replacement-guide","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/2020-audi-a6-pcm-replacement-guide\/","title":{"rendered":"2020 Audi A6 Engine Computer Problems: PCM\/ECM Replacement Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">PCM<\/div>\n<h1>2020 Audi A6 Engine Computer Problems: PCM\/ECM Replacement Guide<\/h1>\n<p class=\"hero-subtitle\">The powertrain control module (PCM) or engine control module (ECM) in your 2020 Audi A6 manages fuel delivery, ignition timing, and emissions systems. Failure may cause drivability issues, warning lights, or a complete no-start condition.<\/p>\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>The PCM\/ECM in your 2020 Audi A6 integrates engine and transmission control for optimal performance.<\/li>\n<li>Replacement typically requires 1.0 hours of labor, plus relearn procedures that add 0.5 hours.<\/li>\n<li>Common symptoms include stalling, misfires, or communication errors with the scan tool.<\/li>\n<li>Factory programming is required after replacement, but pre-programmed units eliminate this step.<\/li>\n<li>Internal trouble codes like P0603 or P0606 often indicate module failure.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Audi A6 has been stalling, refusing to start, or displaying warning lights, the engine computer may be the culprit. Known as the powertrain control module (PCM) or engine control module (ECM), this component is the brain behind your vehicle\u2019s performance, managing everything from fuel injection to ignition timing. When it fails, symptoms can range from subtle drivability issues to a complete breakdown. Understanding how this module works, where it\u2019s located, and what replacement involves can help you make informed decisions about repairs. This guide covers the essentials: what the PCM\/ECM does, common failure signs, labor requirements, and why a pre-programmed replacement unit may simplify the process. Whether you\u2019re diagnosing an issue or preparing for a repair, you\u2019ll gain clarity on how to restore your Audi A6\u2019s reliability without unnecessary complications.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>What the PCM Does in a 2020 Audi A6<\/h2>\n<p>In your 2020 Audi A6, the powertrain control module (PCM) or engine control module (ECM) serves as the central command for engine and transmission operations. It continuously monitors sensors to adjust fuel delivery, ignition timing, and emissions controls, ensuring optimal performance and efficiency. Without a functioning module, your vehicle may struggle to start, idle roughly, or even enter a fail-safe mode that limits power. The PCM\/ECM also communicates with other onboard systems, such as the transmission control module, to coordinate shifting and torque delivery. When this module fails, it can trigger a cascade of issues, from poor fuel economy to erratic shifting. Replacing it isn\u2019t just about swapping hardware\u2014it\u2019s about restoring the precise calibration that keeps your Audi A6 running smoothly. A <a href=\"https:\/\/www.fs1inc.com\/audi-ecm-pcm-ecu-engine-computer\/a6-engine-computers.html\">replacement engine computer for the Audi A6<\/a> must match the original specifications to avoid compatibility issues, which is why many owners opt for units that arrive ready to install without additional programming steps.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Where the PCM Is Located and What Replacement Involves<\/h2>\n<p>The engine control module in your 2020 Audi A6 is typically located near the engine bay, often mounted on the firewall or inside a protective housing to shield it from heat and moisture. Accessing it may require removing a few bolts or clips, but the process is straightforward for a technician. According to factory labor estimates, replacing the module takes about 1.0 hours. This includes disconnecting the battery, unplugging the wiring harness, and securing the new unit in place. While the physical installation is relatively quick, proper handling is critical\u2014static electricity or improper torque on mounting bolts can damage sensitive electronics. Once installed, the module must be reconnected to the vehicle\u2019s network, and the battery should be reattached to restore power. The location and mounting design are engineered for durability, but exposure to extreme conditions or voltage spikes may still lead to premature failure.<\/p>\n<div style=\"background:#f7f9fc;border:1px solid #e2e8f2;border-radius:10px;padding:18px 24px;margin:18px 0\">\n<h3 style='margin-top:0'>How to Reach the PCM on the 2020 Audi A6<\/h3>\n<ol style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\"><b>Open<\/b> the retainers and remove the Engine Control Module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the connectors (example illustration).<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the connectors -2 and 3.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Release<\/b> the retainers and remove the Engine\/Motor Control Module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the connectors.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Disconnect<\/b> the connectors -1 and 2.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\"><b>Open<\/b> the retainers and remove the Engine\/Motor Control Module.<\/li>\n<\/ol>\n<p style='margin:10px 0 0 0'><em>Work with the ignition off, and treat the module as static-sensitive: avoid touching the connector pins at any point.<\/em><\/p>\n<\/div>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Operation<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Configuration<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Book Time<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">1.0 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Powertrain Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Relearn<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.5 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module Reset<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">0.3 hr<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Engine Control Module R&amp;R<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">All configurations<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">1.0 hr<\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Programming Requirements After Replacement<\/h2>\n<p>After replacing the engine control module in your 2020 Audi A6, the factory procedure requires a relearn process to synchronize the new unit with the vehicle\u2019s systems. This typically involves a 0.5-hour procedure to reset adaptive values, calibrate sensors, and ensure proper communication with the transmission and other modules. Without this step, your vehicle may experience drivability issues, such as rough idling or poor acceleration. However, opting for <a href=\"https:\/\/www.fs1inc.com\/2020-audi-a6-2-0l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\">a VIN-programmed replacement unit<\/a> eliminates the need for these additional steps, as the module arrives pre-configured to match your Audi A6\u2019s specifications. This not only saves time but also reduces the risk of programming errors that could lead to further complications. While some shops may still perform a reset (0.3 hours) to clear any residual codes, the core programming is already handled, allowing for a seamless installation.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Symptoms of a Failing PCM<\/h2>\n<p>When the engine control module in your 2020 Audi A6 begins to fail, symptoms can vary but often include noticeable drivability issues. You may experience intermittent stalling, especially at idle or during deceleration, as the module struggles to maintain consistent fuel and ignition timing. A no-start condition is another common sign, where the engine cranks but fails to fire due to incorrect sensor readings or fuel delivery commands. Warning lights on the dashboard, such as the check engine light, may illuminate, often accompanied by trouble codes like <a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\">an internal processor error<\/a>. Misfires or rough running can also occur, as the module loses its ability to precisely control combustion. In some cases, the vehicle may enter a limp-home mode, limiting power to prevent further damage. Communication errors with a scan tool are another red flag, indicating the module is no longer responding to diagnostic requests. If you notice any of these symptoms, addressing them promptly can prevent more severe issues, such as transmission shifting problems or complete system failure.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Module Trouble Codes on the 2020 Audi A6<\/h2>\n<p>Your 2020 Audi A6 may store specific trouble codes when the engine control module experiences internal faults. These codes help pinpoint the issue and guide repairs. Below are the documented module-internal trouble codes for this vehicle.<\/p>\n<table style=\"width:100%;border-collapse:collapse;margin:18px 0;font-size:15px\">\n<tr>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Code<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Meaning<\/th>\n<th style=\"border:1px solid #d6dbe3;background:#f2f5f9;padding:9px 12px;text-align:left\">Full Guide<\/th>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0603<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Keep-alive memory (KAM) error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0603-internal-control-module-keep-alive-memory-kam-error\/\" style=\"color:#0563C1\"><b><u>Full P0603 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0605<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal ROM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0605-internal-control-module-read-only-memory-rom-error\/\" style=\"color:#0563C1\"><b><u>Full P0605 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0606<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module processor failure<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0606-control-module-processor\/\" style=\"color:#0563C1\"><b><u>Full P0606 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>P060A<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Module-internal fault<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><b>P060B<\/b><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">Module-internal fault<\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\">&mdash;<\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0613-tcm-processor\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0613<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0613-tcm-processor\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0613-tcm-processor\/\" style=\"color:#0563C1\"><b><u>Full P0613 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P062F<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Internal EEPROM error<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p062f-internal-control-module-eeprom-error\/\" style=\"color:#0563C1\"><b><u>Full P062F guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0667-control-module-internal-temperature-sensor-rangeperformance\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>P0667<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0667-control-module-internal-temperature-sensor-rangeperformance\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-p0667-control-module-internal-temperature-sensor-rangeperformance\/\" style=\"color:#0563C1\"><b><u>Full P0667 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<tr>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-u0100-lost-communication-ecmpcm\/\" style=\"color:#0563C1;text-decoration:none;display:block;cursor:pointer\"><b>U0100<\/b><\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-u0100-lost-communication-ecmpcm\/\" style=\"color:#1a2b49;text-decoration:none;display:block;cursor:pointer\">Module-internal fault<\/a><\/td>\n<td style=\"border:1px solid #d6dbe3;padding:9px 12px\"><a href=\"https:\/\/www.fs1inc.com\/blog\/dtc-u0100-lost-communication-ecmpcm\/\" style=\"color:#0563C1\"><b><u>Full U0100 guide &rarr;<\/u><\/b><\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n<div class=\"info-section\">\n<h2>Protecting the PCM in Your 2020 Audi A6<\/h2>\n<ul style=\"margin:14px 0 6px 0;padding-left:26px\">\n<li style=\"margin:10px 0;line-height:1.65\">Maintain a healthy charging system to avoid voltage spikes that can damage the module.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Ensure battery connections are clean and tight to prevent electrical interference.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Avoid jump-starting the vehicle with improper voltage, as this can overload sensitive electronics.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Address warning lights or trouble codes promptly to prevent cascading failures.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Keep the module\u2019s connector and wiring harness free of corrosion or moisture.<\/li>\n<li style=\"margin:10px 0;line-height:1.65\">Use dielectric grease on connectors to protect against water intrusion and oxidation.<\/li>\n<\/ul>\n<\/div>\n<div class=\"info-section\">\n<h2>Frequently Asked Questions<\/h2>\n<h3>How do I know if my 2020 Audi A6\u2019s engine computer is failing?<\/h3>\n<p>Common signs include stalling, a no-start condition, or warning lights on the dashboard. You may also notice rough idling, misfires, or communication errors with a scan tool. If the vehicle enters limp mode or stores module-related trouble codes, the PCM\/ECM may be the issue.<\/p>\n<h3>Can I replace the engine computer in my 2020 Audi A6 myself?<\/h3>\n<p>While the physical replacement is straightforward, the module requires programming to match your vehicle\u2019s specifications. Without the proper tools or software, you may encounter drivability issues. A pre-programmed unit simplifies the process, but professional installation is still recommended.<\/p>\n<h3>What causes the engine computer in my 2020 Audi A6 to fail?<\/h3>\n<p>Failure can result from voltage spikes, moisture intrusion, or prolonged exposure to heat. Corrosion on connectors or poor battery health may also contribute. In some cases, internal electronic components degrade over time, leading to malfunctions.<\/p>\n<h3>How long does it take to replace the engine computer in a 2020 Audi A6?<\/h3>\n<p>The physical replacement typically takes 1.0 hours, according to factory labor estimates. However, additional time may be required for relearn procedures or programming, which can add 0.5 hours or more to the process.<\/p>\n<h3>Will a used engine computer work in my 2020 Audi A6?<\/h3>\n<p>A used module may physically fit, but it must be programmed to match your vehicle\u2019s VIN and specifications. Without proper programming, the module may not communicate with other systems, leading to drivability issues or warning lights.<\/p>\n<\/div>\n<div class=\"info-section\">\n<p>If your 2020 Audi A6 is experiencing engine computer issues, you have options. A repair may be possible if the failure is isolated to a specific component, but replacement is often the most reliable solution. Opting for a pre-programmed unit eliminates the need for additional programming steps, saving time and reducing the risk of errors. Whether you choose a new or refurbished module, ensure it matches your vehicle\u2019s specifications to restore performance and reliability. Addressing the issue promptly can prevent further complications and keep your Audi A6 running smoothly.<\/p>\n<p>Flagship One stocks a <a href=\"https:\/\/www.fs1inc.com\/2020-audi-a6-2-0l-pcm-engine-computer-ecm-ecu-programmed-plug-play.html\"><b>refurbished, VIN-programmed PCM for the 2020 Audi A6<\/b><\/a> with a lifetime warranty, free shipping and no core charge. The full <a href=\"https:\/\/www.fs1inc.com\/audi-ecm-pcm-ecu-engine-computer\/a6-engine-computers.html\">Audi A6 module lineup<\/a> covers other engine configurations as well.<\/p>\n<\/div>\n<div class=\"info-section\">\n<h2>Final Thoughts<\/h2>\n<p>The engine computer in your 2020 Audi A6 plays a critical role in maintaining performance, efficiency, and drivability. When it fails, symptoms like stalling, misfires, or warning lights can disrupt your driving experience. Understanding the replacement process, labor requirements, and programming needs helps you make informed decisions. Whether you opt for a repair or a pre-programmed replacement, addressing the issue promptly ensures your Audi A6 remains reliable for miles to come.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>2020 Audi A6 stalling, no-start, or warning lights? Learn how the engine computer controls performance, common failure symptoms, and why a VIN-programmed replacement may save time and money.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[309,258],"tags":[676,334,310],"class_list":["post-532623","post","type-post","status-publish","format-standard","hentry","category-audi","category-car","tag-676","tag-a6","tag-audi"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>2020 Audi A6 Engine Computer Problems: PCM\/ECM Replacement Guide - Flagship One Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fs1inc.com\/blog\/2020-audi-a6-pcm-replacement-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"2020 Audi A6 Engine Computer Problems: PCM\/ECM Replacement Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"2020 Audi A6 stalling, no-start, or warning lights? 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