My check engine light came on, i went to auto zone, they gave me a slip to take to the mechanic. lean air. so i replaced the fuel filter it was clogged, now the light is still coming on. took back to auto zone, and still the same reading. what do you think it could be. i was thinking of changing my air filter since it has not been changed in a very long time.
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Re: check engine light
toolchickick IS GIVING YOU UNRELATED/INCORRECT INFO TO YOUR PROBLEM, IT IS OBVIOUS THIS EXPERT DOES NOT UNDERSTAND HOW MODERN OBD 2 EMISSION SYSTEMS OPERATE, YOU HAVE POSSIBLE PROBLEMS WITH THE O2 SENSORS, THIS IS WHAT THE CODE'S INDICATE, FURTHER HANDS ON TESTING IS REQUIRED TO PIN DOWN IF THE CODES WILL BE REPAIRED BY A O2 REPLACEMENT.
Yes, worth changing the air filter. Had the same problem recently and that cured it (are your having hesitation at startup, by any chance?). If not, could be the oxygen sensors. It's worth dealing with this sooner rather than later -- it's probably decreasing your mileage.
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ok lets start with the codes they say your getting. P??? which 1's and how many. there are few o2 sensors, are they next to the Exhaust next to the converter? MASS AIR FLOW -MAF use this, for now i am guessing, until i see the correct codes your are getting. this could be the 1 you may have below, please read it........
Faulty mass air flow sensor
- Intake air leaks
- Dirty mass air flow sensor
- Dirty mass air filter
- Mass air flow sensor harness is open or shorted
- Mass air flow sensor circuit poor electrical connection
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.
possible symptoms Engine Light ON (or Service Engine Soon Warning Light)
- Engine stall
- Engine running rough
- Excessive fuel consumption
- Excessive smoke
the code is generated when An excessively high voltage from the sensor is sent to Engine Control Module (ECM).
p0171 is system to lean ( bank 1 ). did you turn off check engine light with a scanner! if not go to auto-zone and they will erase it for free, then you can see if light stays off. There could be a vacuum leak downstream of the MAF sensor.
Inspect all vacuum and PCV hoses, replace if necessary
Check for a dirty fuel filter and proper fuel pressure. Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. good-day!!
The 02 sensor is detecting a malfunction in the emissions. That would be from a bad fuel mixture, too rich or too lean caused by dirty or faulty injectors or MAF sensor. A clogged catalytic converter will also cause it. Connect a manual fuel gauge to the fuel rail and test your fuel presuure. Test your fuel pressure regulator, the fuel pressure should increase 5-10 pounds when you disconnect the regulator...if it don't, the regulator is bad...Check for vacuum leaks and stuck or dirty egr valve. This would cause a lean condition. Check your air filter. Good luck, i hope this helps.
A lean bank 1 and 2 is indicating there is not enough fuel being injected to support proper combustion.
Leading causes can include but are not limited to......
1) low fuel pressure or plugged fuel filter.
2) vacuum leak causing lean condition.
3) air intake hose or crank case not sealed properly and bypassing the MAF sensor or the MAF sensor element is dirty.
4) wrong fuel or poor quality fuel used.
Hope this helps. If the Service Engine Soon light is illuminated, there will be fault codes associated the light. Get the vehicle scanned for free at your local Auto Zone or Advanced Auto and report back.