O2 sensor problem


E

EkRon

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Jan 15, 2010
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126
Right lads, my engine check light came on over the Christmas because I hadn't started it in days during the snow. I put two pins (snipped paper clip!) into a block connector in the ECU and got a code from the lights in the cluster flashing. I looked up the codes and it turned out to be my O2 sensor.

I fitted a second hand sensor but the engine check light still comes on. Could this be due to the second hand sensor doesn't actually work or do I have to do something to the ECU again?

Really pissing me off at this stage!
 
Did you reset ecu? If not remove negative lead off battery for a minute or pull fuse labelled "back up" in under bonnet fuse box.
 
Vtec6000 said:
Did you reset ecu? If not remove negative lead off battery for a minute or pull fuse labelled "back up" in under bonnet fuse box.
Click to expand...

How do I reset it? I removed the negative lead form the battery but no joy. I'll try the bonnet fuse box tomorrow. Cheers for replying
 
To reset the ecu you have to take the fuse out for the ecu, I think it's a 15amp and also take the backup fuse out too. Leave it out for about 5-10 mins then put the fuse back in and start the car but don't touch the throttle. Let it idle for about 5-10mins.

Hope this helps :)
 
Don't need to leave battery lead or fuse out for 5-10mins. It resets after a minute. Was it the same type plug on 02 sensor you fitted? what car did it come from?
 
The sensor wasn't from an ek9, came out of an ek4 but the fittings are the exact same. The overall length is slightly longer than the original sensor...
 
Shoruwar said:
To reset the ecu you have to take the fuse out for the ecu, I think it's a 15amp and also take the backup fuse out too. Leave it out for about 5-10 mins then put the fuse back in and start the car but don't touch the throttle. Let it idle for about 5-10mins.

Hope this helps :)
Click to expand...

Where abouts is the 15 amp fuse? Fuse box under dash or bonnet?
 
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