When the lambda sensor is mapped out...

[kineticz]

...with a stage 2 map, is it normal for there to be a fault code on the ECU? I'm getting fault code 17526 which seems to be

17526 - Oxygen (Lambda) Sensor Heating; B1 S2: Open Circuit

This is post-cat sensor. So is this normal?

Thanks

 

[AntneeUK]

Can't comment for your exact setup as I've never done it on the Leon, but I know in some cases you need a 'loop back adapter' or something to that effect. I've heard them called 'O2 Sensor Eliminator' too, which convinces the ECU that the sensor is there and reporting all OK

 

[kineticz]

But the point of the stage 2 mapping was to remove the lambda sensor entirely from the ECU's system?

The sensor is unplugged if that's what's causing it? Maybe if I plug it back in, the map will work as it should

I've contacted P torque to see what they say.

 

[dh00001]

I found an online guide to use resistors and capacitors to fool the o2 sensor into thinking its fine.
I have an old sensor I will try this with when my bits arrive from RS. Will post the results

 

[AntneeUK]

I didn't realise that a fueling map could tell the ECU to completely ignore the sensor. I thought it was just designed to work with some kind of eliminator. As I say though, my knowledge on the subject is not from Leons though

 

[kineticz]

Well the ECU is showing up codes that look like the pre-cat sensor has failed,

17524 - Oxygen (Lambda) Sensor Heating: B1 S1: Open Circuit
16518 - Oxygen (Lambda) Sensor B1 S1: No Activity

 

[AntneeUK]

Is the sensor there? Because if it's not, then of course it will say that there's no activity

Look in to the eliminator if nobody else comes back with anything more useful

 

[lc_allan]

I have mine stage 2 mapped out but the sensor is still in place. The port on the exhaust however is blocked up. I don't think I had that error when I last scanned codes.

 

[Faisal]

when i got my exhaust done, the garage shrowded the sensor. but due to recent work on the exhaust, the lambda message has come back up again...

 

[kineticz]

Anyone know a good place to get a replacement pre-cat lambda sensor from?

 

[kineticz]

Found this, looks like my best option atm.

http://cgi.ebay.co.uk/Bosch-Front-L...arts_Vehicles_CarParts_SM?hash=item5d27952b51

Quite looking forward to fitting it actually, if the old one has been deteriorated for some time. The power is still there, great fun, just a little... hesitant at times and below average mpg of course.

Cheers