P1177
O2 Correction Behind Catalyst B1 Limit Attained
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)
Symptoms
- Increased fuel consumption
- Check Engine Light Is On
- Reduced engine power
- Increased level of harmful emissions
- Unstable engine operation at idle
Causes
- Malfunction of the catalytic converter
- Leaks in the exhaust system
- Problems with the rear oxygen sensor
- Front oxygen sensor malfunctions
- Problems with the fuel system (injectors, pressure regulator)
How to Fix
- Check the condition of the catalytic converter
- Inspect the exhaust system for leaks
- Check the functionality of the oxygen sensors
- Check the condition of the fuel injectors and pressure regulator
- Scan the system for other errors