Lost communication with catalyst temperature Bank 2 sensor 1 your vehicle causes U0686—emissions risk. Scan, test wiring, then reprogram or replace module.

Your vehicle loses catalyst temperature data (U0685). This can cause emissions failures—scan, check wiring, and reprogram or replace the sensor module.

Your vehicle shows U0684 – lost communication with catalyst temp sensor Bank 1. Emissions can fail; scan, test the sensor, reprogram or replace module.

Throttle pedal dead or check‑engine light on your vehicle? Lost communication with Throttle/Pedal Position Sensor/Switch F can cut power—wire, reprogram.

Throttle feels dead on your vehicle? Lost communication with Throttle/Pedal Position Sensor/Switch E can cut power. Scan, test wiring, replace/re‑program.

Throttle pedal unresponsive in your vehicle? Lost communication with Throttle/Pedal Position Sensor D risks unsafe acceleration. Scan and reprogram now.

Check engine light and loss of fuel trim on your vehicle? U0680 means barometric sensor B stopped talking—scan, inspect wiring, plan module repair.

Missing shifts in your vehicle? Lost communication with Fluid Pressure Sensor A can damage transmission – scan and have the sensor/module repaired.

Fuel gauge dead or erratic on your vehicle? Lost communication with Fuel Level Sensor C can give false reads—scan, test, and re‑program or replace.

Fuel gauge dead on your vehicle? U0677 indicates lost communication with Fuel Level Sensor B—scan the network, test the sensor, then reprogram or replace.