Fan 1 Underspeed warning on your vehicle? Reduced cooling can overheat the engine—scan the P0494, verify fan operation, and arrange module repair now.

Cooling fan spins too fast on your vehicle? Fan overspeed can overheat the engine or drain the battery—scan P0493, test fan circuit, repair/reprogram.

Low exhaust airflow on your vehicle? P0492 means insufficient AIR system flow Bank 2 – it can harm emissions; scan, test, reprogram or replace the module.

Low air flow on your vehicle? P0491 = AIR System Insufficient Flow Bank 1 – can trigger emissions issues. Scan and reprogram the module immediately today.

Check engine light on your vehicle and reduced fuel economy? EGR A control circuit can cause emissions failure—scan, test the EGR, then repair or replace.

EGR A control circuit low lights the check engine on your vehicle—risking emissions failure. Scan P0489, test the EGR circuit, then repair or replace.

EGR throttle control out of range on your vehicle? It can cause emissions failures and performance loss. Scan the circuit, then reprogram or replace.

EGR throttle control circuit A open on your vehicle? It can set a check‑engine light and affect emissions. Scan, test the circuit and replace or reprogram.

Check engine light from an EGR Sensor B Circuit fault on your vehicle? It can raise emissions—scan, test the circuit, then repair or replace the sensor.

Fan stalls or runs on your vehicle? Faulty fan power/ground circuit can overheat the engine. Scan the circuit, test the fan module, repair or replace.