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Author Topic: failed MOT  (Read 2794 times)

Offline gazpowells

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failed MOT
« 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
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Offline itavaltalainen

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Re: failed MOT
« Reply #1 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.
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Offline tweed

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Re: failed MOT
« Reply #2 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
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Offline Bellend

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Re: failed MOT
« Reply #3 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...
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Offline gazpowells

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Re: failed MOT
« Reply #4 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
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Offline Wayne

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Re: failed MOT
« Reply #5 on: 27 February 2013, 21:06 »
Another trick for undoing Lamba probes is to try with the exhaust warm (but be carefull)
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Offline Len

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Re: failed MOT
« Reply #6 on: 28 February 2013, 10:38 »
You need good quality spanners to undo the Lambda.
Never had a problem myself.
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Offline GOLF-MK3-GTI

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Re: failed MOT
« Reply #7 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
« Last Edit: 28 February 2013, 11:18 by GOLF-MK3-GTI »
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Offline Len

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Re: failed MOT
« Reply #8 on: 28 February 2013, 12:45 »
Fifty Quid! :shocked:
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Offline GOLF-MK3-GTI

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Re: failed MOT
« Reply #9 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:
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