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P1135 Fault Diagnosis and Repair on 2001 Toyota Tacoma

Model: 01 Tacoma Fault Code: P1135 Posted: 2007-10-03 22:32

The P1135 diagnostic trouble code on a 2001 Toyota Tacoma refers to an issue with the Air Fuel Metering Sensor, which is located on the intake manifold. This sensor plays a critical role in monitoring air-fuel mixture for optimal engine performance and fuel efficiency. After replacing the Mass Airflow (MAF) sensor and resetting the system, the P1135 code returned after approximately one minute of driving—indicating a recurring issue. While vehicle performance remains stable, fuel economy has noticeably decreased. The root cause appears to be either a defective replacement MAF sensor or an electrical circuit fault in the Air Fuel Metering Sensor circuit. Testing the circuit integrity is essential; if the MAF sensor is new and the code persists, it suggests that either the part itself is faulty or there's a wiring or connection issue. This experience may help other owners of 2001 Toyota Tacomas experiencing similar P1135 issues after MAF sensor replacement.

Related fault codes
P1135
Comments (4)
Anonymous 2007-10-04 08:46

What was the final solution? Was it a new oxygen sensor or another component?

Anonymous 2007-10-04 22:29

Grinchster Joined: 29 Sep 2007 Posts: 3 Posted: Sat Sep 29, 2007 9:09 pm Post subject: 01 Tacoma P1135 code -------------------------------------------------------------------------------- 2001 Toyota Tacoma, Ext cab 4WD, 3.4 Litre V6, 106000 miles, 5 speed manual, I have a P1135 (Air Fuel Metering) code after replacing the Mass Airflow Sensor and resetting the system. The code returns after about one minute of driving. Performance is normal but fuel economy has dropped significantly. Any advice or troubleshooting steps would be greatly appreciated. Grinchster Back to top jeff compton Joined: 10 Jan 2006 Posts: 3561 Location: Orleans Ontario Canada Posted: Mon Oct 01, 2007 6:20 am Post subject: -------------------------------------------------------------------------------- Check the circuit for continuity and voltage—could be a wiring or connection issue. Back to top Grinchster Joined: 29 Sep 2007 Posts: 3 Posted: Mon Oct 01, 2007 9:48 pm Post subject: -------------------------------------------------------------------------------- I'm not familiar with how to test the circuit for faults—can you recommend a step-by-step method? Back to top jeff compton Joined: 10 Jan 2006 Posts: 3561 Location: Orleans Ontario Canada Posted: Tue Oct 02, 2007 5:56 am Post subject: -------------------------------------------------------------------------------- If the MAF sensor is new and the P1135 code returns, then either the replacement part is defective or there's a fault in the circuit—this needs further diagnosis. Back to top Grinchster Joined: 29 Sep 2007 Posts: 3 Posted: Wed Oct 03, 2007 10:00 pm Post subject: -------------------------------------------------------------------------------- Okay, I've decided to stop pursuing this—seems like a complex issue without clear guidance. Back to top User Posted: Thu Oct 04, 2007 8:30 am Post subject: -------------------------------------------------------------------------------- This thread is not helping. I don't fully understand the problem or how to diagnose it. I agree with Jeff—this needs more technical clarity.

Anonymous 2007-10-05 05:50

Okay I give up!

Anonymous 2007-10-05 10:00

This is going nowhere. Im not sure I even understand what the problem is. Im with you COMP.