[335tim]

I installed the Cobb ap2 and so far have been very happy with the results. However, after a bit of a boot yesterday, the engine light came up. I went to my Indy as I was local and it came up with oxygen sensor problems on his machine.

U have plugged my Cobb in and read the codes and it's scared the life out of me. Pages of em although only the top 3 explained what they are. These were the oxygen sensor ones. Some pics.....

It's strange because I've had the engine light and limp mode before but it always displays on the main screen. This time the engine light only appears on the dash directly in front of the steering wheel.

My Indy says the oxygen sensor needs to be replaced but that are all the other codes? Has the Cobb done this do you think or an existing problem?

Help much appreciated.

[335tim]

Update, just these codes come up now:

[idnan]

First of all, ignore the codes starting with H as they are historic codes. Only the codes starting with P are current.

Tim I can say 100% that an o2 sensor has failed on your car. From the error codes, they all relate to Bank 1 which is the o2 sensor for the front 3 cylinders before your primary cats, so right by the turbo.

I would say it has nothing to do with the Cobb, I had a similar issue with my car when I was running a JB4. When you start increasing the power you find the weak links in the car which can't handle it.

The sensor is about £100 for a genuine Bosch one which is the same as the BMW ones but is in a different box. It isn't the easiest job as space is limited.

Finally, there are different levels of engine management codes. If the error is serious enough it will throw a P3100 fault code which indicates limp mode. This error wouldn't trigger it but looking at the pics you had a h3100 which was limp mode in the past (as you mentioned)

HTH mate.

[idnan]

http://www.ebay.co.uk/itm/LS17098-Bo...item23326fa151

£110.40 delivered

[335tim]

Originally Posted by idnan

First of all, ignore the codes starting with H as they are historic codes. Only the codes starting with P are current.

Tim I can say 100% that an o2 sensor has failed on your car. From the error codes, they all relate to Bank 1 which is the o2 sensor for the front 3 cylinders before your primary cats, so right by the turbo.

I would say it has nothing to do with the Cobb, I had a similar issue with my car when I was running a JB4. When you start increasing the power you find the weak links in the car which can't handle it.

The sensor is about £100 for a genuine Bosch one which is the same as the BMW ones but is in a different box. It isn't the easiest job as space is limited.

Finally, there are different levels of engine management codes. If the error is serious enough it will throw a P3100 fault code which indicates limp mode. This error wouldn't trigger it but looking at the pics you had a h3100 which was limp mode in the past (as you mentioned)

HTH mate.

Thanks Idnan, once again very helpful.

Yes I have had a few limp modes in the past. Its happened mostly when putting my foot down joining motorways from slip roads. My indy seems to think that the faulty 02 sensor could be the cause of the limp mode. I think he was saying that the car would go in to limp mode as a protection because its sensing the fuelling is incorrect when im putting my foot down.

Does that sound right to you?

[idnan]

Originally Posted by 335tim

Thanks Idnan, once again very helpful.

Yes I have had a few limp modes in the past. Its happened mostly when putting my foot down joining motorways from slip roads. My indy seems to think that the faulty 02 sensor could be the cause of the limp mode. I think he was saying that the car would go in to limp mode as a protection because its sensing the fuelling is incorrect when im putting my foot down.

Does that sound right to you?

Yeah it sounds right as the codes point to that one specific problem in the car. I would however make sure they change just the one o2 sensor as it is pretty pointless changing the others if they are working fine. Get the Bosch sensor and get them to change it for you.

[zltm089]

Originally Posted by 335tim

Thanks Idnan, once again very helpful.

Yes I have had a few limp modes in the past. Its happened mostly when putting my foot down joining motorways from slip roads. My indy seems to think that the faulty 02 sensor could be the cause of the limp mode. I think he was saying that the car would go in to limp mode as a protection because its sensing the fuelling is incorrect when im putting my foot down.

Does that sound right to you?

i'd check for carbon built up and the injectors too.

[335tim]

Do either of those issues throw codes?

[zltm089]

Originally Posted by 335tim

Do either of those issues throw codes?

I used to have the warning light/ limp mode error when i floored it on the motorway, after 1 hour of driving when the engine was fully warm. I didn't have a code reader at the time...so not sure what codes would have come up... the garage replaced, the injectors and they found excessive carbon built up....

[zltm089]

Originally Posted by 335tim

Do either of those issues throw codes?

listen to idnan, he knows his stuff!

[335tim]

Originally Posted by zltm089

listen to idnan, he knows his stuff!

He certainly does!