- SCANNER CODE P0171

1999 Dodge Neon

Tiny

MAUEL

February, 14, 2010 AT 6:29 PM

Engine Mechanical problem
1999 Dodge Neon 4 cyl Two Wheel Drive Automatic 77,000 miles

I HAVE AN OB 2 SCANNER AND I DID A DIAGNOSTIC ON MY 1999 DODGE NEON WHICH READS CODE P0171, " TIMING BELT SKIPS ONE OR TWO TEETH', MY QUESTION IS WILL THIS BE SOMETHING THAT WILL PREVENT MY VEHICLE FROM PASSING A SMOG CHECK?

FOUND 162 RELATED QUESTIONS

1 Answer

Tiny

rasmataz

February, 15, 2010 AT 4:09 AM

P0171 Lean A/F mixture

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

Check engine light coming on might cause you to fail the test-

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