When it comes to luxury SUVs from the late ’90s, the 1999 Lexus RX300 often stands out as a pioneer in the crossover segment. Known for its smooth ride and upscale features, this vehicle quickly became a favorite among drivers seeking a blend of comfort and practicality. However, like any car that’s been on the road for over two decades, the RX300 isn’t without its quirks and issues. In this blog post, we’ll dive into some of the common problems owners have faced with the 1999 model and explore its overall reliability. Whether you’re considering buying a used one or just curious about its performance history, we’ve got you covered. Despite its age, the 1999 Lexus RX300 has maintained a reputation for reliability, but it’s important to be aware of the potential pitfalls. From transmission troubles to oil sludge buildup, we’ll discuss the key issues that have been reported over the years. We’ll also take a look at how these problems have impacted the vehicle’s longevity and what you can do to keep an RX300 running smoothly. So, grab a cup of coffee, settle in, and let’s take a closer look at what makes this classic SUV tick—and what might make it stall.
Body Components

Parts Assessed:

Windows, power locks, manual locks, doors, trunk, tailgate, mirrors, power and manual seat controls, seat belts, sunroof, convertible top, glass defects.

Reported Problems:

N/A

Analysis:

No major problem has been reported

Parts Assessed

Brake pads, brake rotors, brake calipers, anti-lock braking system (ABS), brake lines, brake master cylinder, brake booster, parking brake, brake sensors, regenerative braking system (if applicable).

Reported Problems:

  • Check Engine Light Due to Failed O2 Sensor

Analysis:

The 1999 Lexus RX300 is generally a reliable vehicle, but one common issue that pops up is the check engine light due to a failed O2 sensor. This problem can affect the car’s fuel efficiency and emissions, but it’s usually a straightforward fix. Overall, while it’s a bit of a hassle, it doesn’t significantly impact the vehicle’s overall reliability.

Parts Assessed

Air conditioning compressor, AC condenser, AC evaporator, heater core, blower motor, automatic climate control system, refrigerant leaks, HVAC electrical components, temperature sensors, ventilation system.

Reported Problems:

  • Debris in Idle Air Control Valve May Cause Engine Problems

Analysis:

The 1999 Lexus RX300 is generally known for its reliability, but one issue to keep an eye on is debris in the Idle Air Control Valve, which can lead to engine problems. This can cause rough idling or even stalling, so its something to address if you notice any symptoms. Regular maintenance and cleaning of the valve can help prevent these issues and keep your RX300 running smoothly.

Parts Assessed

CV joints, driveshaft, axles, differential, limited-slip differential (if applicable), traction control system, electronic stability control (ESC), four-wheel-drive (4WD) components, all-wheel-drive (AWD) components, transfer case, driveline vibration.

Reported Problems:

  • Check Engine Light and Lack of Power Due to Failed Mass Air Flow Sensor

Analysis:

The 1999 Lexus RX300 is generally a reliable vehicle, but one common issue that owners might encounter is the check engine light coming on due to a failed mass air flow sensor. This problem can also lead to a noticeable lack of power, which can be frustrating. While it’s not a deal-breaker, it’s something to keep an eye on if you’re considering this model.

Parts Assessed

Infotainment system, GPS navigation, Bluetooth connectivity, touchscreen display, phone pairing, backup camera, rear entertainment system, head-up display, instrument cluster, digital gauges.

Reported Problems:

  • Ignition Coil May Fail After 100,000 Miles

Analysis:

The 1999 Lexus RX300 is generally a reliable vehicle, but one issue to keep an eye on is the ignition coil, which may start to fail after 100,000 miles. While this isn’t a deal-breaker, it’s something to be aware of as the car ages. Regular maintenance and timely replacement can help keep your RX300 running smoothly.

Parts Assessed

Radiator, radiator hoses, cooling fan, water pump, thermostat, antifreeze leaks, engine coolant reservoir, overheating prevention system, intercooler (if applicable).

Reported Problems:

  • Excessive Oil Consumption

Analysis:

The 1999 Lexus RX300 is known to have issues with excessive oil consumption, which can be a bit of a headache for owners. This problem might lead to more frequent oil changes and could potentially affect the engine’s longevity if not addressed. While the RX300 is generally considered a reliable vehicle, this particular issue is something to keep an eye on if you’re thinking about owning one.

Parts Assessed

Alternator, battery, ignition switch, ignition coil, spark plugs, ignition wires, engine control module (ECM), electronic ignition system, auto stop/start function, battery cables, engine wiring harness, fuse box, relays, starter motor.

Reported Problems:

  • Sludge Buildup on Engine Due to Infrequent Oil Changes

Analysis:

The 1999 Lexus RX300 is generally a reliable vehicle, but one common issue to watch out for is sludge buildup in the engine, which often results from infrequent oil changes. This can lead to significant engine problems if not addressed, so it’s crucial to maintain a regular oil change schedule to keep the engine running smoothly. Overall, with proper maintenance, the RX300 can still be a dependable ride.

Parts Assessed

Engine rebuilds, cylinder head, head gasket, timing chain, timing belt, camshaft, crankshaft, connecting rods, turbocharger or supercharger (if applicable), valve train, piston rings, oil control system, engine knocking, engine misfires.

Reported Problems:

  • Check Engine Light Due to Faulty Pruge Solenoid

Analysis:

The 1999 Lexus RX300 is generally known for its reliability, but one common issue that pops up is the check engine light due to a faulty purge solenoid. This problem can be a bit of a hassle, as it might lead to emissions issues and affect the vehicle’s performance. However, once addressed, the RX300 tends to run smoothly, maintaining its reputation for being a dependable ride.

Parts Assessed

Muffler, catalytic converter, exhaust manifold, heat shields, exhaust pipes, oxygen (O₂) sensors, resonator, exhaust leaks, emissions control system.

Reported Problems:

  • Front Suspension Noise Due to Failed Support Bushing

Analysis:

The 1999 Lexus RX300 is generally known for its reliability, but one common issue that pops up is front suspension noise due to a failed support bushing. This problem can lead to annoying sounds and potentially affect the smoothness of your ride. While it’s not a deal-breaker, it’s something to keep an eye on if you’re considering this model.

Parts Assessed

Fuel pump, fuel injectors, fuel rail, fuel pressure regulator, throttle body, fuel gauge sensor, evaporative emissions system, EGR (exhaust gas recirculation) valve, charcoal canister, fuel filter, fuel tank, vapor leaks.

Reported Problems:

  • Low Engine RPM or Stalling on Cold Start

Analysis:

The 1999 Lexus RX300 is generally a reliable vehicle, but some owners have reported issues with low engine RPM or stalling during cold starts. This problem can be a bit annoying, especially in colder climates, but it’s not a deal-breaker for most drivers. Regular maintenance and timely repairs can help mitigate this issue and keep the RX300 running smoothly.

Onboard & Powertrain Electronics

Parts Assessed

Cruise control, keyless entry system, push-button start, wiper motor, warning lights, power mirrors, interior lighting, exterior lighting, dashboard indicators, electronic parking brake, tire pressure monitoring system (TPMS), alarm and security system, remote engine start, heated and ventilated seats, heated steering wheel, wireless charging pad.

Reported Problems:

  • Rough Idle and Backfiring Engine with Check Engine Light

Analysis:

The 1999 Lexus RX300 is known to have some issues with rough idling and backfiring, often accompanied by the check engine light. These problems can be a bit of a headache, as they might indicate underlying issues with the engine or fuel system. While the RX300 is generally a reliable vehicle, these specific problems can affect its overall dependability if not addressed promptly.

Parts Assessed

Dashboard rattles, squeaks, wind noise, door seals, weather stripping, water leaks, air leaks, excessive road noise, suspension noise, drivetrain noise, exhaust rattles, engine bay noises.

Reported Problems:

N/A

Analysis:

No major problem has been reported

Parts Assessed

Paint durability, clear coat protection, rust prevention, corrosion resistance, body panel alignment, door seals, window trim, plastic trim, metal finishes, fading, cracking, peeling.

Reported Problems:

N/A

Analysis:

No major problem has been reported

Parts Assessed

Struts, shocks, control arms, sway bars, ball joints, tie rods, wheel bearings, power steering pump, power steering fluid leaks, electronic power steering (EPS), steering rack and pinion, steering linkage, alignment issues, torsion bars, springs, air suspension (if applicable).

Reported Problems:

N/A

Analysis:

No major problem has been reported

Parts Assessed

Transmission rebuild, transmission replacement, torque converter, transmission solenoids, gear selector, gear shifting, transmission control module (TCM), transmission fluid leaks, clutch (manual transmission), automatic transmission valve body, CVT (continuously variable transmission) components, dual-clutch transmission (DCT) components.

Reported Problems:

N/A

Analysis:

No major problem has been reported

Conclusion

Facebook
Twitter
LinkedIn
Picture of Flagship One

Flagship One

The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.

What Customers Think About Us

[trustindex no-registration=google]