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need help; 02 sensor acting up
Topic Started: Sep 9 2013, 05:57 PM (167 Views)
dogfightpro
Stage 1
Getting a 21 flash code which is for the o2 sensor.

Bench tested my recently replaced sensor and its working bang on so its not the sensor.

Next up got a mechanic to do a continuity test, he said all was good there. He said it could be a bad cat backing up the exhaust fumes that is causing the sensor to give a wrong reading so I put in a de-cat but the flash code kept coming.

Next I put in a standard ecu but no change.

There is an apexi safc on the car so I thought the previous owner might have done the blue wire mod for an o2 read out but I checked and he didnt.

Does anyone have any ideas what it could be?
Any irish lads have a number for a good auto electrician in the north east? Im from monaghan but the closest large town to me is dundalk if that helps.

would really appreciate some replys as I have nct next week and thought this was gonna be an easy fix!!!
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rob twincam 20v
Stage 5
Have you reset the ecu by disconnecting the battery for 10mins. Your best off taking out the safc cause the standard ecu rejects it after a few days.
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dogfightpro
Stage 1
Yeah I reset the ecu. If I unplug the safc the engine light comes on and the idle drops to 600. There is no program on the safc cause I reset it
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