wires_dirty on Toyota MAF (Mass Air Flow sensor)
www.4x4wire.com/toyota/maintenance/tacoma_4runner_30k/wir...
Urgent / Recall Notice 60I-Reprogram ECM
My wife's '01 RAV4 has had the P0420/P0430 code (cat efficiency below threshold) occur since '03. When it first happened, I took it into the dealership and they replaced the cat under the 80K emissions warranty and forgot to reset the light so I did with my OBDII scanner. I thought all was well until the light came back on a couple days later. This time I read the code and it gave a lean code (P0171/P0174). I called the dealer again and they said it needs new O2 sensors and wanted to charge me an arm and a leg since O2 sensors are considered electrical and not emissions (stupid EPA rules, I know). Anyway, I told them no thank you and started to see if it indeed was the O2 sensors. I did lots of searching and it wasn't until I brought up the issue with a buddy of mine that is a Nissan/Infiniti master tech that I found the solution. He suggested that it's probably a dirty MAF sensor and said that older Maximas had the exact same problem. I figured it was worth a try so I took out the MAF (located on the back side of the intake tubing and is removed in about 10 minutes with 2 screws) and cleaned it with brake cleaner (also have used throttle body cleaner -- better idea). After waiting a few minutes to let it dry, I reinstalled the MAF sensor and reset the codes and voila! problem solved for good...at least for a year or so when it gets dirty again. Apparently Toyota's original ECM program's acceptable MAF readings is too narrow so when the MAF gets a little dirty it freaks out. I've had to clean the MAF two times since and every time the problem was solved (last year it registered the infamous P0420/P0430 code again and this year it threw the lean codes -- P0171/P0174).
Occasional problems on this vehicle are failure of the Mass Air Flow (MAF) Sensor and the Engine Control Module (ECM) software.
Occasional problems on this vehicle are failure of the Mass Air Flow (MAF) Sensor and the Engine Control Module (ECM) software. The MAF and ECM software will cause the check engine light to illuminate. Toyota has revised the software so the Check Engine Light will not illuminate falsely and set trouble codes related to the Catalyst System. Factory warranty covers this software update for 8 years or 80,000 miles. The cost to replace the MAF Sensor is estimated at $139.95 for parts and $52.00 for labor. The cost to recalibrate the ECM is $65.00 for labor. All prices are estimates based on $65.00 per flat rate hour and do not include diagnostic time or any applicable sales tax.
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