- leak in the air induction system
- clogged/gummed up PCV / hoses
- dirty or gummed up injectors
- dirty MAF sensor
- faulty ECT coolant temperature sensor
- reduction in fuel pressure (clogged fuel filter / faulty pressure regulator)
- exhaust leak
- short /open oxygen sensor (short / open in heater circuit)
- faulty ECM
- multiple ground loops / bad chassis grounds
- bad tank of gas
I'd just run down the list, hitting the ones that you can check visually first (i.e., free fixes), then dive into a more through diagnostic. Hard to tell from the snapshot you posted - if the car is running fine, aside from the CEL, no stubbling/hesistantion/etc. - then I'd either try a different gas station and/or add a bottle of decent fuel injector cleaner. Just to see if the code comes back.
Do you have datalogging capabilties? What have you done maintenance wise so far?
The only thing that gets me worried is the STFT and LTFT being quite a bit more than +/- 25% and I'm assuming that you're not WOT at that point (actually one of the requirements in order to run the DTC - TP sensor not past a certain point, speed is less than some threshold, temperature, mass air flow, engine speed has to be between a certain range).
For those that might not understand - STFT (Short Term Fuel Trim) and LTFT (Long Term Fuel Trim) are "learned" values by the engine computer or ECU/ECM/PCM (Engine Control Unit / Engine Control Module / Powertrain Control Module). STFT is a dynamic correction to fuel to keep the engine close to stoichiometric or 14.7:1 Air to fuel mix (optimum mixture for efficient combustion). That shouldn't vary too much past +/- 10% but it will vary a lot. LTFT follows the trends calcualted from the STFT - that trend is basically the culmulative average of the STFT readings over time. They will vary, but anything over +/- 25% (STFT + LTFT) is out of spec for this car.
How does the car run otherwise? Any trouble starting, takes longer than usual to start? Does the code come on when the gas tank gets low? Are you running an after market intake, drop in panel filter?
Fish, could a clogged cat converter get the computer to think the fuel mixture is too rich and cause it to spray too lean where it would trip that code?
^^^ Possible, if it was really clogged up, cause exhaust gases to backup and lead to a misfire. That extra fuel would "eat" up whatever oxygen is left in the resulting exhaust mix and the O2 sensor will read a lean condition. I would think it would trip a misfire code - but not always, sometimes the ECM gets fuzzy in its thinking.
888 what gas brand and octane have you been using? Im wondering if you have been using non top tier gas brands or higher octanes to where it could have eventually fouled the converter, injectors ect.
How does the car run otherwise? normal
Any trouble starting, no
takes longer than usual to start? no
Does the code come on when the gas tank gets low? no
Are you running an after market intake, drop in panel filter? no understand
What have you done maintenance wise so far? #87
What have you done maintenance wise so far? 1. clear MAF no good
2. change MAF
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