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Model specific boards => Golf mk4 => Topic started by: k-ro on 19 April 2011, 18:57

Title: VERY high exhaust emissions - MOT fail
Post by: k-ro on 19 April 2011, 18:57

Basically, everything is way too high!
CO, HC & lambda are all ready massively high. MOT tester says they are the higher hes ever seen.
Before we start replacing parts, anyone got any idea why all of them would be so high?

fyi,
CO level = 8.19%
HC level = 413ppm
Lambda - 0.79

Cheers
Kev

Title: Re: VERY high exhaust emissions - MOT fail
Post by: MaXXeH on 19 April 2011, 19:38

u got decat?

Title: Re: VERY high exhaust emissions - MOT fail
Post by: houston on 19 April 2011, 19:41

first thing to do is scan it to see if theres any fault codes. how longs it been since its been serviced?

Title: Re: VERY high exhaust emissions - MOT fail
Post by: daz veedub on 19 April 2011, 20:28

+1 scan, service if needed and check is de-cat on

Title: Re: VERY high exhaust emissions - MOT fail
Post by: AudiA8Quattro on 19 April 2011, 20:32

Failed ecu coolant temperature sender.

Title: Re: VERY high exhaust emissions - MOT fail
Post by: Wayne on 19 April 2011, 21:05

Quote from: AudiA8Quattro on 19 April 2011, 20:32

Failed ecu coolant temperature sender.

^^ This, replace it as a 1st step.

Title: Re: VERY high exhaust emissions - MOT fail
Post by: k-ro on 19 April 2011, 21:06

Standard cat on.
Serviced just over a year and a half ago, but a couple of oil and filter changes since.

It's getting scanned for errors tomorrow, just trying to get a few clues in the meantime.
I thought temp sender, but can that throw all those out so much?


Cheers all

Title: Re: VERY high exhaust emissions - MOT fail
Post by: Wayne on 19 April 2011, 21:07

Quote from: k-ro on 19 April 2011, 21:06

I thought temp sender, but can that throw all those out so much?

Yes as it will think it is cold and dump in more fuel.

Title: Re: VERY high exhaust emissions - MOT fail
Post by: mouth0502 on 11 July 2011, 18:00

sorry new to the site unsure how to post how did you resolve this issue mine is doing the same thing cheers adam :cry: :cry:

Title: Re: VERY high exhaust emissions - MOT fail
Post by: AaronGS on 11 July 2011, 22:31

Would a failed temp sender show up on VAG-COM?

Title: Re: VERY high exhaust emissions - MOT fail
Post by: daz veedub on 11 July 2011, 22:38

mine did sure its 16500

Title: Re: VERY high exhaust emissions - MOT fail
Post by: danny_p on 11 July 2011, 22:51

Quote from: AaronGS on 11 July 2011, 22:31

Would a failed temp sender show up on VAG-COM?

normaly  but not allways

Title: Re: VERY high exhaust emissions - MOT fail
Post by: AaronGS on 11 July 2011, 23:18

Cheers guys. I too have had higher than normal (for my caranyway) emissions and was wondering about this as the culprit. no codes comin up though.

Title: Re: VERY high exhaust emissions - MOT fail
Post by: AudiA8Quattro on 12 July 2011, 00:09

Quote from: AaronGS on 11 July 2011, 22:31

Would a failed temp sender show up on VAG-COM?

It should do.
It showed up my brother's 1993 polo, and that's got very basic diagnostics.