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Model specific boards => Golf mk3 => Topic started by: gazpowells on 24 February 2013, 21:11

Title: failed MOT
Post by: gazpowells on 24 February 2013, 21:11

after some help please

car failed mot friday with high emissions after looking at it today i noticed the previous owner has un-pluuged the lamba sensor would this cause very high emissions?

Garage said the CO and Lamba reading was well over would the sensor un plugged corse this or has my cat gone?
any help or advice appreciated

thanks

Title: Re: failed MOT
Post by: itavaltalainen on 24 February 2013, 21:58

reason for it being unplugged... my guess it threw a fuse (the one for the fuel pump) which will logically make the engine stop....

with lambda disconnected it would use a default value.... which is chosen to be slightly rich mixture (less damaging than too lean).... probably checked how much a new one of them was and decided to f**k it (or the old one is stuck he couldnt be bothered to get it out.... hate when people do this....
bet it's not the only issue with it...

I would try to replace lambda sensor, go for a decent quality one... then hook it up to vcds and check it works again (check the vagcom/vcds user list in the garage section). then test in garage if cat was damaged.

Title: Re: failed MOT
Post by: tweed on 24 February 2013, 22:20

I put my cat in a vice then undo the sensor. They are tight and hard to do with it fitted to the car or on the floor.

And your problem is the unplugged sensor

Title: Re: failed MOT
Post by: Bellend on 24 February 2013, 22:41

Try undoing it first. Undone one on an 8v and one on my 1.6 both with a spanner on the vehicle. Both undid surprisingly easily...

Title: Re: failed MOT
Post by: gazpowells on 25 February 2013, 19:58

thanks guys

Took cat off today to get old sensor out and somebody has removed its insides   :sad:

so new cat and sensor ordered today

hope this sorts it  :smiley:

now to fix all the other fails lol

Title: Re: failed MOT
Post by: Wayne on 27 February 2013, 21:06

Another trick for undoing Lamba probes is to try with the exhaust warm (but be carefull)

Title: Re: failed MOT
Post by: Len on 28 February 2013, 10:38

You need good quality spanners to undo the Lambda.
Never had a problem myself.

Title: Re: failed MOT
Post by: GOLF-MK3-GTI on 28 February 2013, 11:17

Quote from: Len on 28 February 2013, 10:38

You need good quality spanners to undo the Lambda.
Never had a problem myself.

There's an actual tool for the job itself, Its like a socket that's got a cut out on the side for the lambda wires to go through and all you do is turn it with a ratchet. Very Easy  :cool:

http://tools-from-germany.com/en/HAZET/HAZET-4680-2-Lambda-Probe-Socket

Title: Re: failed MOT
Post by: Len on 28 February 2013, 12:45

Fifty Quid! :shocked:

Title: Re: failed MOT
Post by: GOLF-MK3-GTI on 28 February 2013, 13:36

Quote from: Len on 28 February 2013, 12:45

Fifty Quid! :shocked:

I'm sure you can find one cheaper, Good Old Ebay hey  :rolleyes:

Title: Re: failed MOT
Post by: Bellend on 28 February 2013, 13:52

They're alright gotta watch the cables though.

Title: Re: failed MOT
Post by: vr6D4v3 on 28 February 2013, 17:46

Dont bother with those sockets as when you turn them with some force the cut out opens up and will slip, spanner is always the best option

Title: Re: failed MOT
Post by: gazpowells on 28 February 2013, 21:35

i got one these sockets and still could not get it out!!  so ran engine until cat was warm (hot  :sad:) and burned my hand lol

so just removed cat glad i did as i found out it had been all bashed out and would never of got my mot anyways 

Title: Re: failed MOT
Post by: carpetviper on 01 March 2013, 07:04

I always found it easier to take off the cat and use a decent open ended spanner however if your changing it I usually cut the old wires to see if the old one will come out easier.

The new one doesn't have to go in that tight as the heat will do the rest.

Title: Re: failed MOT
Post by: gazpowells on 04 March 2013, 20:15

finally got MOT today  :smiley: