[JFP in PA]

Originally Posted by theWalkinator

My car is 2001 2.7, the original MAF is Bosch F 00C 2G2 064, the replacement MAF is also Bosch, the part number is 0280 218 055/986 606.125.02, I ordered it from RockAuto, and before I ordered it, I double checked FCP Euro and Pelican Parts, they all show this MAF for my car, is this replacement MAF not the correct one?

Also, my codes are
P1128, P1130 Adaptation idle range Below Limit Value
P1126, P1133 Adaptation lower load range Exceed Limit Value.

I searched and saw someone posted that for P1128, P1130 Adaptation idle range Below Limit Value, the car is running rich and ECM is trying to take fuel away and reaches the limit, and STFT is around 25% and RKAT is pegging at 4.5%, I am confused, is the car running lean or rich? If it is running rich then that explains why there is no vacuum leaks detected.

The causes for P1128, P1130 Below Limit Value could be:
– Incorrect signal from MAF sensor
– Fuel pressure too high
– Fuel injector leaking
– EVAP canister purge valve open

So
- Incorrect signal from MAF - wrong MAF sensor?
- Fuel pressure too high - Pressure tests at the fuel rails are fine, idle 3.3 bar, engine off 3.5 bar
- Fuel injector leaking - how to test leaking injectors? the car only have 33km so leaking injectors seems unlikely
- EVAP canister purge valve open - EVAP vacuum leaks cannot be detected by intake smoke test, correct? the purge valve is under driver side intake manifold so that is my next thing to check, how can I check it without fighting to remove it ?


I also add that the car was running fine but the codes popped up after I cleaned throttle body, not immediately after but for a while it developed rough idle and eventually those 4 codes popped up.

The fact that the codes you are seeing is an impossibility (overly lean and rich at the same time) says something is wrong. Most likely problem is that you inadvertently "upgraded" to the later MAF (part number ending in 125 01 or higher) when you replaced the original MAF, which REQUIRES the DME be recoded in order for it to work properly, which requires access to a PIWIS system.