Cel for all o2 sensors

[350Chris]

In the last couple of weeks, the car has started throwing cel lights with the fault codes referencing all o2 sensors.

 

One here and there owing to the berks I can expect but all on is one for investigation. I plan to get the car up on ramps tomorrow to check for a leak in the exhaust system or an obviously broken wire or sensor but can anyone shed any light on what this could be caused by?

 

Performance isn't down nor is the exhaust note

Edited December 21, 2012 by 350Chris

[jumping350]

you prob need O2 spacers from Alex to keep sensor out of exhaust stream

[Allan Zada]

Have you got a fault code reader which tells you if the fault is logged as its running rich or running lean?

[350Chris]

you prob need O2 spacers from Alex to keep sensor out of exhaust stream

 

It has had the setup fitted for a long time - I would have expected it to throw codes consistently if it was that

[ZMANALEX]

you prob need O2 spacers from Alex to keep sensor out of exhaust stream

 

It has had the setup fitted for a long time - I would have expected it to throw codes consistently if it was that

 

Oh how wrong you could be :

 

Is it front or rear sensors that you are having the issue with?

 

Alex,

[350Chris]

It's throwing the lot up;

 

P0139

P0159

1146

1166

1147

1167

 

I will put the description to them when I'm not posting from my phone

 

It would surprise me that it suddenly decides is wants o2 spacers having run with the exhaust setup for the 8+ months I've had the car plus the longer time that the previous owner had it

Edited December 22, 2012 by 350Chris

[jumping350]

cold weather can bring them on sometimes as well did you have it up on ramps?

[ZMANALEX]

The codes that you have provided are all related to the rear sensors and not the front, so that narrows it down considerably.

 

Best to clear all the codes and start again as some may be archived.

 

You might find that the light may also stay off

 

Alex

[350Chris]

Cheers Alex just looked them up,

 

Cleared them twice now...time to investigate on the ramps then.

 

I did catch a nasty rubber car park hump a few weeks back hence my investigation as to a split in the system

Edited December 22, 2012 by 350Chris

[rtbiscuit]

OBD is only a guide to point you in the direction of investigation, its not always as arruate as an exact component to replace.

 

If your getting funny o2 readings it could also be the MAF as its all part of the AF system

[Allan Zada]

It shouldn't be the MAF, as the engine ecu uses the front lambda probes to check the plausibility of the MAF sensor and these fault codes are for the rears. Which are used to check the efficiency of the cats. Spacers seam like the best answer

[350Chris]

car is still throwing these faults, cant get it on a ramp until next weekend sadly

 

can anyone confirm if it is possible to test o2 sensors on the zed by measuring voltage? if so, what the voltage should be?