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O2 Sensor Issue - Help! Neo Rb25det

iijj

By iijj,
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iijj Community Regular

iijj

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Changed the O2 Sensor after finding Code 33 after the paper clip short trick! Used the EL Falcon one as promoted so widely on these forum. A friend has also just done this and had no issues.

Had to slice and crimp wires to use Standard plug. All wires were same colour so just hooked up white/white, black/black and white white. Ran a little worse initially and so I pulled the paper clip out and the code (33) is still flashing!!!

Is there anything else I am supposed to do? I've scanned through the (25 page!) sticky but don't know if I have done something wrong... Some posts have suggested resetting the ECU but I thought the paper clip short did that upon restart anyway!!! I don't really want to disconnect the battery and stomp on the brake pedal etc etc as I have my hks ebc and Apexi RSM set up nicely!!!

Please, ideas! Thanks in advance!

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chook Mentor

chook

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Posted (edited)
Changed the O2 Sensor after finding Code 33 after the paper clip short trick! Used the EL Falcon one as promoted so widely on these forum. A friend has also just done this and had no issues.

Had to slice and crimp wires to use Standard plug. All wires were same colour so just hooked up white/white, black/black and white white. Ran a little worse initially and so I pulled the paper clip out and the code (33) is still flashing!!!

Is there anything else I am supposed to do? I've scanned through the (25 page!) sticky but don't know if I have done something wrong... Some posts have suggested resetting the ECU but I thought the paper clip short did that upon restart anyway!!! I don't really want to disconnect the battery and stomp on the brake pedal etc etc as I have my hks ebc and Apexi RSM set up nicely!!!

Please, ideas! Thanks in advance!

Have you checked the code again since you reset the ECU, as it might be an error leftover in the memory from before you changed the sensor. Reset it again and see.

Also, if u start the car immediately after resetting it without turning off ignition, it will go into O2 sensor mode, flashing the checklight on and off, depending on lean or rich, cant remember which way, but you will quickly see if its working when you drive it, after it has warmed up.

note, the pic is of an R34 terminal, S2 stagea is upside down in comparison.

post-780-1200570001_thumb.jpg

Edited by chook
iijj Community Regular

iijj

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Thanks Chook!

If the paper clip shorting out trick resets the ECU then I have already reset it, if it doesn't then I may have to do the battery disconnect thing!?! It felt the worst immediately on the 10 minute run hone after checking for codes in the fuse box! Seemed to run smoother and boost cleaner in the next 20 minute run into town...

I'll go out to the car now and check for codes again!

iijj Community Regular

iijj

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OK! So I just checked for codes again and it is flashing 55... which, from memory, means there are no errors!?! So it should be A.O.K??? Is that what the 5 long flashes and 5 short ones means???

I hope so! Shame the kids are asleep or I could go for a spin and check for sure!

Tomorrow!

chook Mentor

chook

Posted
Posted (edited)
OK! So I just checked for codes again and it is flashing 55... which, from memory, means there are no errors!?! So it should be A.O.K??? Is that what the 5 long flashes and 5 short ones means???

I hope so! Shame the kids are asleep or I could go for a spin and check for sure!

Tomorrow!

sounds sweet, 55 is all good, check it again after a few days of driving, but the Bosch EL was the way to go, done it myself.

Like I said, it will store the fault code indefinitely until the ECU is reset, which might be months or years for some cars, even though the fault was fixed long ago.

Edited by chook
chook Mentor

chook

Posted
Posted (edited)
Thanks heaps Chook! Is it still worth doing that Heated Oxygen Sensor Monitor test? Or do you think that will just reveal the typically rich ECU standard pattern???

it should alternate when you are under load/off throttle, even cruising, not that useful and not really sure of the purpose, suppose it just lets you know that its reading.

Edited by chook
blind_elk Grand Master

blind_elk

Posted
Posted
...and boost cleaner in the next 20 minute run into town...
Then it's NOT AN O2 SENSOR PROBLEM!

Any monitor will only alternate rich - lean - rich under static throttle conditions, ie cruise. It will simply go RICH under load / accelleration, and ultra lean under off-throttle.

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