faulty a/f o2 sensor - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

sid3way5 · 01-02-2014, 07:01 PM

my check engine light came on the code said faulty heater in the a/f o2sensor so I had a new one installed at the dealer and the code is still there they think its the relay....my car is boosted and i have a af guage at idle the car is very rich around 10.9 and its very lean during normal driving trying not to drive it unless I have to... any ideas?

kjdd787 · 01-02-2014, 07:06 PM

Quote:

Originally Posted by sid3way5

my check engine light came on the code said faulty heater in the a/f o2sensor so I had a new one installed at the dealer and the code is still there they think its the relay....my car is boosted and i have a af guage at idle the car is very rich around 10.9 and its very lean during normal driving trying not to drive it unless I have to... any ideas?

My boy had the problem in his ms3 a good pro tune solved this problem

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sid3way5 · 01-02-2014, 09:38 PM

Quote:

Originally Posted by kjdd787

My boy had the problem in his ms3 a good pro tune solved this problem

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I text my tuner he said to check all the wires from the sensor to the ecu going to let a subie tech look at it sat

kjdd787 · 01-02-2014, 11:18 PM

Quote:

Originally Posted by sid3way5

I text my tuner he said to check all the wires from the sensor to the ecu going to let a subie tech look at it sat

Quote:

Originally Posted by sid3way5

my check engine light came on the code said faulty heater in the a/f o2sensor so I had a new one installed at the dealer and the code is still there they think its the relay....my car is boosted and i have a af guage at idle the car is very rich around 10.9 and its very lean during normal driving trying not to drive it unless I have to... any ideas?

Running lean could be an actual tuning issue

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wparsons · 01-04-2014, 10:00 PM

Who did the install on your a/f gauge? Is it tapped into the stock front O2 sensor, or is there an extra sensor installed for it?

It's possible that the wiring for the gauge is mucking things up.

sid3way5 · 01-06-2014, 12:06 PM

Quote:

Originally Posted by wparsons

Who did the install on your a/f gauge? Is it tapped into the stock front O2 sensor, or is there an extra sensor installed for it?

It's possible that the wiring for the gauge is mucking things up.

found the problem the fuse for the o2 sensor blew out changed it drove fine till I was under boost and let off it came back on .. the fuse blew again checked the second o2 sensor that was lower down the down pipe we found it was hitting the engine going to relocate the o2 sensor today... great job by toni at fa20club with the position of the o2 sensor

01-02-2014, 07:01 PM	#1
sid3way5 Member Join Date: Apr 2013 Drives: 13 wrb brz greddy evo3 catback..... Location: queens Posts: 66 Thanks: 12 Thanked 4 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	faulty a/f o2 sensor my check engine light came on the code said faulty heater in the a/f o2sensor so I had a new one installed at the dealer and the code is still there they think its the relay....my car is boosted and i have a af guage at idle the car is very rich around 10.9 and its very lean during normal driving trying not to drive it unless I have to... any ideas? __________________ fa20 kit 303/250

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