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05-08-2005, 09:19 AM | #1 | |
AF Newbie
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Location: atlantic beach, New York
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Check engine light code P0171
I have two customers whose vehicles have shown this code. One has 100,000 miles and the other has 50,000 miles . The first is a 99, the second is a 00. Both cars run great and there are no driveability complaints from the customers. The code indicates lean exhaust from bank 1. I have tried a 20 ounce bottle of Techron in both and the light continues to come back after I have cleared the code. I am hesitant to change the o2 sensor without being sure because of the cost. Has anyone run into this problem?
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05-09-2005, 06:13 PM | #2 | |
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Location: peotone, Illinois
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What type of cars are they? I have a 2000 Venture with same code and a friend just told me he had one with a split vacumn hose at the map sensor with a 3400. Going to check this one tomorrow.
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1967 cougar 390 FE in progress 1993 F350 Crew Cab 5.8 111K 1983 Coachman 23ft class C 460 1988 Bronco 351 C6 1964 Galaxie 428 4sp project 1995 Mustang 3.8 Auto 1966 Mustang Fast back Project 1994 Tracer Trio 1.9 1968 F250 Camper Special 390 |
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05-13-2005, 09:26 PM | #3 | |
Resident Chemist
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Re: Check engine light code P0171
For P0171 code (easiest and cheapest first)
1. Check your air induction system for leaks or broken hoses/connections. 2. Put some injector cleaner into a tank of gasoline and see if that helps after you've gone through a tank of treated gas. 3. Buy some no-residue sensor or electronic contact cleaner (NAPA or elsewhere). Remove the connector from the MAF meter spray both sides of the connector thoroughly. Spray the cleaner into every possible exposed portion of the MAF meter in the intake tube and let the cleaner evaporate. Reconnect the MAF meter. 4. Test the engine coolant temperature sensor - replace if out of spec. 5. Check the manifold absolute pressure sensor - replace if out of spec. 6. Check your fuel pressure (not too likely to be the problem). 7. Replace the HO2/A-F ratio sensor with the correct sensor (Bank 1 Sensor 1) - Get a part number from a Toyota parts department with your VIN. 8. Replace the MAF meter. Somewhere along this process, the light should go out and stay out. Most commonly, it is cleaning the MAF meter and connector that solves the problem. Unfortunately, the light can go out for a short period and then reappear - making you think you solved the problem.
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Forum Guidelines:http://www.automotiveforums.com/vbulletin/guidelines.html "What we've got here is a failure to communicate" Last edited by Brian R.; 09-02-2005 at 11:48 PM. |
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05-13-2005, 09:53 PM | #4 | |
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Thanks, went to dealer and got their test procedure and traced it down to the MAF. No more code.
__________________
1967 cougar 390 FE in progress 1993 F350 Crew Cab 5.8 111K 1983 Coachman 23ft class C 460 1988 Bronco 351 C6 1964 Galaxie 428 4sp project 1995 Mustang 3.8 Auto 1966 Mustang Fast back Project 1994 Tracer Trio 1.9 1968 F250 Camper Special 390 |
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05-13-2005, 11:28 PM | #5 | ||
Resident Chemist
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Re: Check engine light code P0171
Quote:
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05-13-2005, 11:39 PM | #6 | |
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replaced after cleaning
__________________
1967 cougar 390 FE in progress 1993 F350 Crew Cab 5.8 111K 1983 Coachman 23ft class C 460 1988 Bronco 351 C6 1964 Galaxie 428 4sp project 1995 Mustang 3.8 Auto 1966 Mustang Fast back Project 1994 Tracer Trio 1.9 1968 F250 Camper Special 390 |
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06-02-2005, 08:16 AM | #7 | |
AF Regular
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Re: Check engine light code P0171
injector cleaner fries o2 sensors. replace o2 sensors with botch will solve problem ive had this problem a lot!
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06-16-2005, 03:10 PM | #8 | ||
Resident Chemist
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Re: Re: Check engine light code P0171
Quote:
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06-16-2005, 03:43 PM | #9 | |
AF Regular
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Re: Check engine light code P0171
so your saying no injector cleaner doesn't harm sensors and let me guess spraying carb cleaner through the intake on the maf wont harm it neither. come on man I'm telling you that some fuel injector cleaner fryes your o2 sensors don't deny my claim when its true.
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06-16-2005, 03:49 PM | #10 | |
AF Regular
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Re: Check engine light code P0171
the Chevron Fuel Injector cleaner with Techron is some good stuff and shouldnt harm your car nor the toyota brand that is dumped in at every 30k mile service by toyota. Dont go by the 99 cent fuel injector cleaner and yes it will burn up your sensors. next thing you know you can get some slick 50 and hope it fixed your thrown rod. LOL
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06-16-2005, 10:24 PM | #11 | ||
Resident Chemist
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Re: Re: Check engine light code P0171
Quote:
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