Fuel trim after the catalytic converter
P2096
Post Catalyst Fuel Trim System Too Lean (Bank 1)
The sensor after the catalytic converter sees a mixture that stays too lean or too rich, even after the computer's corrections.
Fine to drive
Can I keep driving? Yes, in most cases. It won't hurt the car in the short term, but get it fixed. A check engine light that's already on can't warn you about a new problem. It drives normally. Have it looked at before it turns into a catalytic converter code.
What the words mean
- Bank 1 is the side of the engine with cylinder 1. A four-cylinder engine has only one bank.
Common causes
- An exhaust leak ahead of the rear sensor
- An ageing rear oxygen sensor
- A catalytic converter that is wearing out
- A small mixture problem the front sensor isn't catching
Listed roughly from most to least likely. The same code can have different causes on different cars.
What to do
- Check for exhaust leaks.
- Look for other codes that point to the real cause.
- Have the rear sensor and the converter tested.
General guidance. Your owner's manual wins. If a red warning light is on or the car drives differently, stop safely and get help.
Related codes
Track this automatically in Tagwell Auto
Tagwell Auto keeps your car's service dates and mileage, so when a code shows up you know what was done last. With a Bluetooth reader for the car's diagnostic port (called OBD-II), the phone app can read the code itself.