Mazda 3 with fault code P2096 – Post catalyst fuel trim system too lean Bank 1
SYMPTOMS:
- The only indication is engine light is ON (general no complaints regarding poor drivability)
- Code P2096
PROBLEM:
Code P2096 means post catalyst system fuel trim too lean on bank 1. The ECM monitors the air/fuel ratio with an air/fuel sensor and oxygen sensor located on the exhaust. If the ratio is higher than the specified target, the system is too lean.
TEST:
- Check fuel pressure
- Check for intake air leaks
- Check for exhaust leaks
- Check air/fuel sensor operation
- Check bank 1, sensor 1 (pre catalyst) oxygen sensor operation (cycle between 0.1-0.9 volts)
- Check bank 1, sensor 2 (post catalyst) oxygen sensor operation (approximately 0.5 volts steady)
- Check fuel trim readings