All,
The CEL set on my Max two weekends ago showing DTC 0210 (P0174). This indicates that the system detected the left bank was running lean.
Possible faults:
- MAF
- Injector(s)
- Air Intake leak
- Bad O2 sensor
- Exhaust leak
My diagnosis:
- MAF
-> Nope - would likely affect both banks - car runs and pulls fine.
- Injector(s)
-> Nope - listened to each injector (left bank is the front 3 cylinders on the VQ30DE) - each clicks normally and at the same frequency. Also, I didn't get any misfire code or feel any hestitation when driving - so I'm pretty sure it's not one or more injectors...
- Air Intake leak
-> Nope: I had the top of the engine off two years ago when replacing the valve cover spark plug seals and I replaced the upper-intake- manifold gasket as well as all other intake assembly gaskets. Also I'd expect this to affect both banks.
- Bad O2 sensor
-> Most likely. O2 sensors are 60k old - mileage has been down about
10% over the past few months (before CEL tripped)
- Exhaust leak
-> Nope: Didn't feel anything upstream of the O2 - no noise.
So before I order myself a new O2 sensor to swap in -> anyone else have any thoughts or comments on my reasoning, or experience with this fault? I'm too lazy to swap the two front O2 sensors around to see if I can move the fault to the other bank :)
I know on the 5th Gens, system lean codes for both banks would show up at the same time, and that was usually the MAF...
Note: Resetting the ECU (to clear CEL) keeps it off for sometimes a few days, sometimes a few hours.
Thanks, Nirav