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[Millerboy]

Hi guys,
very sorry if this is answered elsewhere but I couldn't find it. Keep getting eml on when driving so I paperclipped it and got code 89, o2 sensor 2 open circuit. Dug out my spare o2 sensor and set to work. Started by unplugging drivers side o2 sensor and starting engine, no eml, and then paperclipping it, same fault. To be completely sure I plugged it back in and then disconnected the passenger side o2, repeated the aabove procedure and got no eml when I started it and no new fault codes, still showing 89! So now I don't know which one to change!!! Please help guys?!?!?! :-?

[Welung666]

02 sensor 2 is off bank 2 (passenger side). The code will remain unless it is cleared using a reader/tech2 or around 25 fault free start cycles. The EML going out and staying out is normally a sign it isn't seeing a fault anymore.

HTH

[Millerboy]

Excellent! Cheers, unfortunately I've just realised that both of my spare o2 sensors are 4 wire ones! DOH

[Millerboy]

I've changed the passenger side sensor and the same fault code is still present and the eml still illuminated intermittently, reasoning that the one I removed must be ok I've now fitted it to the drivers side and unfortunately I am still getting the same fault code that has never gone away and the light still illuminates intermittently on the dash! It's easily had more than 25 staarts and surely if the fault had been cured the light wouldn't still be flashing up on the dash intermittently? I am now very confused!  :-?

[henryd]

you could do with plugging into a tech2 or equivalent and viewing the live data to see if the lamdas are switching correctly

[Kevin Wood]

Remember the fault codes are only clues as to what might be wrong.

Worth checking that there is 12v across the heater terminals of the sensors and checking continuity of the signal wire back to the ECU.

If that all checks out OK you might have a fuelling problem or air leak, for example, which is causing the Lambdas to mis-read.

A look at the live data with a Tech 2 might be useful, but you could also put a multimeter on the Lambda sensor outputs to see what's going on.

Kevin

[Millerboy]

Hmm, food for thought. Could it be related to the fact it will occasionally cut out when it's cold, I drive a few hundred yards and then dip the clutch, it then sometimes dies? Also I think one of my exhaust manifolds is leaking, could this be a contributing factor? I'll get the multi meter out soon as I get an hour free in daylight!
Cheers guys

[Kevin Wood]

Air leaking in through a blowing manifold could well be causing the lambda sensor to mis-read.

Not sure about the stalling. Might be worth cleaning the ICV and EGR valves.

Kevin

[Millerboy]

Cheers Kevin,
I'll get on to it and report back!

[Millerboy]

I've decided to replace both manifold gaskets. This looks like a complete PITA to do, am I correct in this assumption? Is there a link somewhere that shows the process and any shortcuts that may be applicable? Cheers, sorry for being a pain!

[wanguttiz]

Mine throws the same error for both sensors. ECU then sees a medium value of about 0,45V and connected laptop shows the same. I've measured the output voltage for both sensors and it showed that both ar died. One of the showed only ~0,15V and doesn't change when revving, the other had no voltage at all.