mundman

P1128 1-3 RICH THRESHOLD SHOULD I BE CONCERNED. I RESET IT AND IT CAME BACK 1 WEEK LATER. ANY ADVISE?

Loren

P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 . 3) - Rich Threshold
Fault conditions: Fuel/air mixture is so lean that sensing has reached its rich threshold.
FauIt area:
- Intake air system leaking.
- Fuel pressure too low.
- Volume supply of fuel pump too low.
- Fuel injectors fouled.

If DTC P1128 or P1130 (oxygen sensing at rich threshold) is stored in the memory, this means that the fuel/air mixture is too lean.
Air leaks ahead of the oxygen sensors can lead to a fault in adaptation. Also, check exhaust system for leaks.

HAMMER502

ALSO THIS COULD BE A BAD OR DIRTY MAF.IF YOU CAN READ THE ACTUAL VALUES ON THE CAR THE 4-6 CYLINDERS SHOULD BE READING OFF,BUT NOT FAR ENOUGH TO THROW A CODE.