EML won't stay reset with faulty parts replaced?

[Beast666]

Hi all,

 

This is bugging the hell out of me and my wife.

 

Her is200 had the engine management light come on and it was reset a couple of times.

 

The issue was/is bank 2 sensor 1 O2 sensor fault. This had been replaced, in fact all the sensors had been replaced and we kept the old ones as spares and for tests. Our mechanic has done everything he can think of and we even had an auto electrician have a brief look. It was all then reset etc but 15 minutes later...bam, back on. I then got my OBD2 code reader out and yep, same issue, same fault. Reset it and 30 seconds later back in.  It reads the fuel mix as fine etc but it's just bugging us. 

 

Our mechanic has suggested we consider him taking the clocks out and pulling the bulb because he is flummoxed by it. Any suggestions?

[Britprius]

49 minutes ago, Beast666 said:

Hi all,

 

This is bugging the hell out of me and my wife.

 

Her is200 had the engine management light come on and it was reset a couple of times.

 

The issue was/is bank 2 sensor 1 O2 sensor fault. This had been replaced, in fact all the sensors had been replaced and we kept the old ones as spares and for tests. Our mechanic has done everything he can think of and we even had an auto electrician have a brief look. It was all then reset etc but 15 minutes later...bam, back on. I then got my OBD2 code reader out and yep, same issue, same fault. Reset it and 30 seconds later back in.  It reads the fuel mix as fine etc but it's just bugging us. 

 

Our mechanic has suggested we consider him taking the clocks out and pulling the bulb because he is flummoxed by it. Any suggestions?

A small exhaust leek at the front between the two front sensors is the likely cause.
Removing the bulb in the dash is now an MOT fail. The examiner turns on the ignition and watches all the warning lights go out in sequence. Any light not coming on or not going out is a fail.

John.

[Beast666]

1 hour ago, Britprius said:

A small exhaust leek at the front between the two front sensors is the likely cause.
Removing the bulb in the dash is now an MOT fail. The examiner turns on the ignition and watches all the warning lights go out in sequence. Any light not coming on or not going out is a fail.

John.

I did not know that they have gotten that fussy. I will have to investigate a potential leak. My mechanic is one of those who just wants simple in out jobs.. very much appreciated. Wonder if it's a manifold gasket or something.

[scudney]

What code does it throw up,if its a p420,you might have a small exhaust leak near one of the sensors 

[rich1068]

As the two Johns say, could be a leak or just the cats getting tired maybe?

[steve2006]

OEM or aftermarket new sensors?

With your mechanics attitude with pulling the bulb out I would consider finding another.

[scudney]

Steve I have to say I totally agree with you,I would be looking for another mechanic as soon as possible,don't like those that try and cut corners