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Model specific boards => Golf mk3 => Topic started by: Jasikasisback on 30 March 2013, 00:26

Title: can i check for clogged cat by removing lambda sensor?
Post by: Jasikasisback on 30 March 2013, 00:26

ok if i remove the lambda sensor and my rough idle disappears will this tell me that i need a new cat?

just wondering if this test can spot a bad cat  :).

Title: Re: can i check for clogged cat by removing lambda sensor?
Post by: tweed on 30 March 2013, 07:44

Nope sensor is before the cat.

Title: Re: can i check for clogged cat by removing lambda sensor?
Post by: xionsolaris on 30 March 2013, 10:55

U need to road test it tbh if the car is struggling to pick up rpms then it could be blocked cat try bang the cat with ur hand not when hot if it rattles then its collapsed try put ur hand near the tail pipe to feel the pressure its hard to diagnose a cat as its car performance side of things coupd possibly be another fault

Title: Re: can i check for clogged cat by removing lambda sensor?
Post by: Jasikasisback on 30 March 2013, 11:10

ok if the cat is blocked then there is backpressure building up before the cat. if i relieve that pressure just a little bit by removing the sensor it should relieve some of the backpressure if there is any and it should run better. does this make sense?

Title: Re: can i check for clogged cat by removing lambda sensor?
Post by: tweed on 30 March 2013, 11:37

And then the car will run sh!t because it can't get a reading!

Only way to tell is take it off and look.

Why do you think it's blocked?
How is the car running rough?
What have you done/changed so far?