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I ran fault coded on my 2002 Mazda protege. It comes back fuel too lean bank 1. Already had fuel pump checked, and that was not the problem. Any ideas?
Re: I ran fault coded on my 2002 Mazda protege. It comes...
YOU COULD HAVE AIR LEAKS IN THE INTAKE MANIFOLD OR EXHAUST MANIFOLD.RESTRICTED FUEL FILTER AND FUEL INJECTORS.CHECK FOR BROKEN OR LOOSE VACUUM HOSES.FUEL PRESSURE REGULATOR FAILED.
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code p0171 refers to system to lean bank 1==causes intake /exhaust leak--AIR system--MAP/MAF sensor--fuel pressure/pump--injectors--HO2s Have a fuel pressure test done on the fuel manifold to check for blocked filter/faulty pump/fuel pressure regulator faults code p0174 refers to system to lean bank 2 --same causes including hose connection/s code p0420 refers to catalytic converter system -bank 1 efficiency below threshold==causes catalytic converter--wiring--HO23. Check the cat converter is not cracked inside and the oxygen sensor is working.
Make sure you are looking up the code properly. 1283 for Nissan indicates a lean condition on bank 2. See link below. A vacuum leak is likely, but make sure the new sensor is recalibrated. Did you perform the relearn procedure after replacing the sensor? If not, see the second link below. If you ran the relearn procedure and cleared all codes but 1283 comes back, look for a loose vacuum line or leaky intake manifold gaskets. P1283 Nissan Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 21998 2012 Nissan Altima Clear Mixture Ratio Self Learning Control Data
Hi Paul, Have you had a fault code relating to the knock sensor? That sensor controls ignition timing which can have a relationship to the fault codes you report? Regards John
It would help if you could get the car scanned with vag-com, it will show the full fault code.
P0171/ Fuel Trim; Bank 1: System Too Lean Possible Causes
* Mass Air Flow Sensor defective
Possible Solutions
* Check Mass Air Flow Sensor * Check Fuel Pressure Regulation * Check Fuel Pump * Check Injectors * Check Intake System for Leaks * Check Exhaust System for Leaks * Check Secondary Air System for Leaks * Check Vacuum Pipes for Leaks
it means your fuel and air mixture is not correct could be a oxygen sensor or a semi clogged fuel injector lots different things could be try running fuel injector cleaner through see if it helps but really neeed more symptoms
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