Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: carlos_fandango on 28 April 2008, 18:31:15

Title: Feeling SENSORtive
Post by: carlos_fandango on 28 April 2008, 18:31:15

Guys, yet another sensor problem,  :'(
In Feb this year i had the Oxygen Sensor and Crank Sensor Codes flash up on the eml.
So i changed them both, then monday last week the oxygen senosr flashed up again for a couple of days and then went off, yesterday they both started flashing up again and the old girl has gone into limp'ish mode, Done the paperclip again and getting 0130 and 0335 codes.

I doubt they both would fail at the same time again so has anyone any ideas what the prob could be?

Would perhaps a failing IACV have anything to do with it??
I think i have a slight exhaust leak at the manifold too would that have an effect?

Thanks in advance Carlos.

Title: Re: Feeling SENSORtive
Post by: Kevin Wood on 28 April 2008, 18:44:16

A code doesn't necessarily indicate a defective sensor. It indicates the reading from the sensor doesn't tally with other information the ECU has. Lambda sensor codes could be caused by a range of other issues such as misfires, air leaks, clogged air and fuel filters and indeed a faulty MAF.

The 335 indicates crank sensor incorrect signal IIRC, so that does point to a faulty crank sensor. Lambda code could well be related because the fuelling and the RPM signal to the ECU are controlled by the crank sensor, so fuelling may have been affected.

I would take the crank sensor back as it appears to have gone faulty again. Was it a genuine Vauxhall one?

Kevin

Title: Re: Feeling SENSORtive
Post by: carlos_fandango on 28 April 2008, 18:51:20

Kevin,
No unfortunatly they weren't vx gen. couldn't afford it at the time.
Thanks for your help will try taking them back, one can only try.

Carlos

Title: Re: Feeling SENSORtive
Post by: Kevin Wood on 28 April 2008, 18:57:51

I would try the crank sensor forst. Lambda sensor code might be consequential.

Did the codes definately clear after you'd changed them the first time?

Kevin

Title: Re: Feeling SENSORtive
Post by: carlos_fandango on 28 April 2008, 19:04:23

Yes they did, went off straight away.

I can't understand why they come on and go off again as they did last week though. I thought it might have been a wiring fault maybe.

Title: Re: Feeling SENSORtive
Post by: rickyboy on 28 April 2008, 20:21:39

The blowing exhaust will definitely be responsible for the o2 sensor fault.  Need to fix that pronto!  Seems to be fairly common for non genuine vauxhall sensors to fail unfortunately, so look likes the crank sensor needs replacing.  

I'd fix the exhaust, reset the codes and see what happens.  If the crank sensor fault won't clear you'll know it needs replaced.

Title: Re: Feeling SENSORtive
Post by: Kevin Wood on 28 April 2008, 23:18:18

Didn't spot the manifold blow. Yes, I agree that'll be leaking air into the exhaust and influencing the lambda sensor's signal.

Kevin