What causes rich condition only when accelerating?

A leaking injector or incorrect sensor reading (MAP/MAF) that causes the ECM to add too much fuel during acceleration.

Can this damage the catalytic converter?

Yes — rich running sends unburned fuel into the cat, potentially overheating and destroying it.

Medium Severity

Fuel System

Bank 1 runs rich off-idle.

Common Fix

Fix leaking injector

Estimated Cost (DIY)

$40 - $200

Leaking injectorlikely

Faulty MAP/MAFpossible

Need to read or clear this code?

What causes rich condition only when accelerating?: A leaking injector or incorrect sensor reading (MAP/MAF) that causes the ECM to add too much fuel during acceleration.
Can this damage the catalytic converter?: Yes — rich running sends unburned fuel into the cat, potentially overheating and destroying it.

Need a diagnosis for your specific vehicle?

100% Free — No signup required