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Chris (aka-Moose)
Chris (aka-Moose), Auto Technician
Category: Toyota
Satisfied Customers: 811
Experience:  16 years of experience
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CRAZY WITH A P0171 CODE. I HAVE TAKEN THE CAR TO 3 SHOPS.

Customer Question

Customer: MY NAME IS***** GOING CRAZY WITH A P0171 CODE. I HAVE TAKEN THE CAR TO 3 SHOPS. THEY HAVE REPLACED THE VALVE COVER GASKET, CLEANED THE MAFS SENSOR, CHANGED THE OXYGEN SENSOR, CHANGED INJECTORS, REPLACED FUEL PUMP,REPLACED THE INTAKE MANIFOLD GASKET AND CARS STILL HAS THE CODE!!! PLEASE HELP. 2003 TOYOTA COROLA
JA: Thanks. Can you give me any more details about your issue?
Customer: CAR DRIVES OK HAS CHECK ENGINE LIGHT
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Submitted: 10 months ago.
Category: Toyota
Expert:  roy replied 10 months ago.

good afternoon my name is ***** ***** I will assist

the 171 code is a lean code. possible causes are

1. vacuum leak

2. mass air flow sensor

3. pcv valve

4. low fuel presure

I see they have checked some of these items. cleaning a mass air flow sensor never works. the carbon is baked on the element and no cleaner can take it off. this is monitored by looking at long term trim for bank 1.

do you have a scan tool to be able to help track down the failure???

Roy

Customer: replied 10 months ago.
A scan tool for mass air flow sensor?
Expert:  roy replied 10 months ago.

a scan tool to monitor all sensors.

Roy

Expert:  roy replied 10 months ago.

do you still need help

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