How do I fix error P0171 too lean?
What repairs can fix the P0171 code?
- Replacing the fuel pump.
- Replacing the fuel filter.
- Replacing the fuel pressure regulator.
- Replacing the powertrain control module.
- Replacing one or more injectors.
- Replacing one or more oxygen sensors.
- Replacing the mass air flow sensor.
- Repairing a vacuum leak.
What repairs can fix the P0171 code?
Remove the mass airflow sensor and clean the sensor using mass air flow cleaner or contact cleaner. Reinstall the mass airflow sensor and clear the check engine light using FIXD. If the check engine light comes back on with code P0171 continue the diagnostic process.
Can a MAF sensor cause P0171?
An “under reporting” Mass Air Flow Sensor can be a common cause of a code P0171. Essentially, this means that the Air Flow Sensor is telling the computer that much less air is entering the engine than actually is.
Can spark plugs cause P0171 code?
Can bad spark plugs cause p0171? – Quora. Not likely. A P0171 ( too lean, Bank 1 ) code is most often caused by a vacuum leak downstream from the MAF sensor or a malfunctioning MAF sensor. Bad spark plugs could actually cause the opposite code ( too rich, bank 1).
Can a dirty air filter cause a P0171 code?
If the filter is clogged or excessively dirty, this is enough to impede or restrict the air flow, hence resulting in a lean running condition. Besides a dirty air filter, the P0171 code can also be blamed on a dirty or faulty MAF sensor and a clogged fuel filter.
Can a bad catalytic converter cause a P0171 code?
No, a bad catalytic converter cannot damage an engine. A modern vehicle has two sensors that monitor the exhaust gases – before the converter and one after.
Should I clean or replace MAF sensor?
MAF sensors can become damaged, but more often they just get too dirty to do their job well. In this case, they can be cleaned but if it is a mechanical or electrical failure, they must be replaced.
What to do if your Subaru has a p0171 code?
If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced. The cost to diagnose the P0171 SUBARU code is 1.0 hour of labor.
What does the p0171 code in front oxygen sensor mean?
If the P0171 is combined with the P0174 code, it’s very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replace the air filter and clean the air flow meter. If the problem persists the front oxygen (O2) sensor may need to be replaced.
Is the p0171 system lean or leak down?
Spools up perfect, pulls hard as hell but idles a little rough and pops a P0171 CEL. Compression and leak down test was good so everything internally is solid. Anyone have any ideas?? Otherwise, LSS is the next step to figure this thing out .
Is there a front O2 leak on a Subaru?
Lonnie I have to say you’re a very thoughtful seller, most would just play dumb or disable the code to sell it. If the front O2 is known good, it almost has to be a vacuum leak. Have you hooked up a vacuum gauge to actually see what it’s pulling at idle?