Suspected Lambda issue

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djmhall

Member
Messages
105
Hi experts,

I have had an intermittent CEL since having my new exhaust put on by Pro-Speed in Cardiff. I finally managed to get my head round an ODB2 reader and have unearthed the following.....

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and .....

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When running, the three values shown above all move - I get nothing at all for the lower left "Long term fuel trim (bank 1)"

This kind of makes sense against the pending fault.

I am working on the theory that I have 1 Lambda out on one side - or I have a bad connection on 1 Lambda.

Has anyone any ideas which Lambda this could be refering to? I.e. near side or off side - front lambda or rear one?

Dom
 
Last edited:
Emtee

Emtee

New Member
Messages
8,446
Dom, You're getting the engine CEL yes? Might be they've tugged the Lambda plug when fitting the exhausts. Check the connectors. Bit of a pain to get at. Directly behind the fans. Drop the front tray off the bumper and you'll be able to get at them from below. I know a dodgy connection does throw the CEL, but doesn't put the car in limp mode.
 
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djmhall

Member
Messages
105
Yes, the CEL light comes on after about two trips after I do a battery reset. I think there must be a good chance that a connector has been half tugged out. I would have thought that an old and failing lambda would give some voltage, but not zero! How easy isit to take the front tray off?
 
Emtee

Emtee

New Member
Messages
8,446
Not difficult Dom. Once the front end is up on stands it's readily accessible. I need to pop into my indi' tomorrow. I'll mention it to them and see whether they have any pointers.
 
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bumoleo

New Member
Messages
21
Hi,

I would also hazard a guess that its the connector to the sensor rather than the sendor at all assuming that 0% means 0% of the sensor voltage.
How about pulling off the connectors to the sensors one by one and seeing if any other of the fields show 0%, this will then narrow it down to the
which sensor/connector is duff. I mean if you pull off a connector and the other readings are still showing then you have found the candidate.
There are 4 lambda sensors in total, 2 at the front and 2 at the back.

You could also check with a voltmeter between the sensor body and the engine, more than 0.1volt could indicate a bad earth?

Cheers,
Martin

p.s. nice ODB2 software, where did you get that from?
 
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djmhall

Member
Messages
105
Well, I managed to get enough time today to put the car up on stands and have a good look underneath. The front connectors were very easy to get access to without removing the undertray, so I disconnected them, gave them a good spray with switch cleaner and put them together again - nothing looked out of place. The rear connectors again looked ok - no obvious breaks or anything loose, but I ran out of time at this point.

The next step is to try again, as you suggest Martin, disconneting the lambdas one by one to see if I can replicate the symptoms and identify the culprit. I must admit I am disappointed that it wasn't a simple and obvious disconnection.

The ODB2 software and lead came from Gendan http://www.enginecheck.co.uk/pro/

I tried a cheap one off ebay, but never got it to work. Gendan offered good advice on the phone, support their own product and it worked first time!

Dom
 
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Memo01

New Member
Messages
13
hello all
question: djmhall, I want a software for my 4200
Where can I get engine check from pro thank you
 
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