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Peugeot 106 CO MOT failure
RichardK - 19/3/11 at 07:50 PM

Hi guys,

wonder if you could possibly help, my lads car just failed it's MOT on friday evening with these results:

CO 0.66% (Max 0.30%) FAIL.
HC 64ppm (Max 200ppm) PASS
Lambda 1.01 (0.97-1.03) PASS

We just gave the car a damn good service today that included changing the spark plugs, air filter, oil filter and oil. Went back to the garage after giving it a blast up and down the motorway to get the cat nice and hot for a retest; however it is still reading high at 0.40%

The tester did give it a good go at trying to pass it for us but he suspects that the cat may be on it's way out. Any ideas guys? Would a fuel additive bring it down enough to get it through, or do I just bite the bullet and buy a new cat for around £40. As it's a 1999 car it doesn't have to be CE approved.

Cheers

Rich

iceman26 - 19/3/11 at 07:58 PM

had one in yesterday same fault have you cleaned the breathers out as these will put co over
that is what i did to get the car to pass mot

big_wasa - 19/3/11 at 08:04 PM

The way I look at it is another £40 is cheap for another years mot.

RichardK - 19/3/11 at 08:05 PM

Nah, didnt do that, would you be able to describe where they are??

Cheers

Rich

britishtrident - 19/3/11 at 08:11 PM

Yes but I would also change the Lambda sensor and check very carefully for inlet maifold leaks.
It would be good to check the the Lambda sensor output --- I am willing to bet after 12 years it will be responding too slowly and drifted out of calibration.

mikemph - 19/3/11 at 08:24 PM

High co can be rich mixture...but hc would generally go up aswell! Retarding the timing a few degrees can help alot to reduce emissions.

I'm not sure if you can do that on a 106 probably not I guess.

As the lambda is reading about right retarding timing would be good, but I guess the cat would be on it way out if it is very old.

Mike

froggy - 19/3/11 at 08:32 PM

have a look at the cat ,if it has a flange all the way round its a cheap replacement that does well to last 2 years . from the figures and if the tester tried hard to get the cat hot i would put a new one on

RichardK - 19/3/11 at 08:54 PM

quote:
Originally posted by froggy
have a look at the cat ,if it has a flange all the way round its a cheap replacement that does well to last 2 years . from the figures and if the tester tried hard to get the cat hot i would put a new one on


Thats what he said, about 18 months tops for a non ce approved one or about 5 years for a ce one, ce one is 3 times the price though and my lad is probably going to sell it in sept when he goes to uni so a non ce one would be ok.

Think I'll try a cat first, then lambda if no good.

Cheers gang

Rich

johny p - 19/3/11 at 09:04 PM

come and see me pal.. ill sort it for ya....

RichardK - 19/3/11 at 09:48 PM

quote:
Originally posted by johny p
come and see me pal.. ill sort it for ya....


Cheers buddy, I'll let you know how I get on..

Ta

R

DRC INDY 7 - 20/3/11 at 01:00 AM

The fault is the cat if you replace it with the cheap wash coat cats expect to replace it again come Mot time

loggyboy - 20/3/11 at 01:27 AM

Disconnect the lambda, it will go in to a default mode and drop the mixture and runner leamer. Worked well on my redtop a few years ago when the lambda was faulty. A new lambda solved it permantly but disconnecting it (at the sugggestion of the tester!) got it a pass.
Dont leave it disconected for long though!

[Edited on 20/3/11 by loggyboy]

RichardK - 20/3/11 at 09:28 AM

Thanks chaps