Mot failure - Downpipe exhaust major gas leak

TheHappyCreative

Hi all,

My car failed it's Mot. They state that the downpipe exhaust gas a major leak of exhaust gases (7.1.2). I'm just wondering if any else had this problem with their car or any mechanics know how much roughly it would cost to fix?

I have a 53 reg Peugeot 307 if this helps?

Kind regards

Hyperxr

TheHappyCreative wrote: »

Hi all,

My car failed it's Mot. They state that the downpipe exhaust gas a major leak of exhaust gases (7.1.2). I'm just wondering if any else had this problem with their car or any mechanics know how much roughly it would cost to fix?

I have a 53 reg Peugeot 307 if this helps?

Kind regards

Prices will vary from garage to garage but you're probably looking at around the ~£200 mark for parts and labour.

The part itself shouldn't be more than £100.

JustinR1979

Depends if it's the join, if it's an all in one part with cat.
My downpipe is all one piece with cat, snapped in half so got a mate to weld it.

Joe_Horner

It's going to vary depending on the exact model, where you are, who you use and so on. As a very rough guide, Mr Exhaust offer pricing by model here:

http://www.mrexhaust.co.uk/exhausts/peugeot/307/

Click on your car by model and year. By downpipe they probably mean the "manifold catalyst" but may mean any front link pipe fitted, or it may simply be a joint failed if you're really lucky - don't count on it though!

EdGasket

A manifold cat-downpipe combo for my car costs more than the car is worth (hence I have a spare car for spares)!

TheHappyCreative

Oh right, thanks for your help guys. I'll see what they say tomorrow when I take it in.

Just a quick last question because I'm not overly car savvy;
Why can the car pass the overall emissions test, but fail the Mot due to a leak of gases?

Thanks again!

molerat

The emissions are measured at the tail pipe only, if all the nasties are not getting there they cannot be measured

Ebe_Scrooge

TheHappyCreative wrote: »

Oh right, thanks for your help guys. I'll see what they say tomorrow when I take it in.

Just a quick last question because I'm not overly car savvy;
Why can the car pass the overall emissions test, but fail the Mot due to a leak of gases?

Thanks again!

Because the gasses are escaping from the downpipe, so there's less gasses coming out of the tail pipe where they measure it.

JustinR1979

Because the % of whats in the gases at the tailpipe is within spec.

FiremanDave

JustinR1979 wrote: »

Because the % of whats in the gases at the tailpipe is within spec.

Is tha because the down pipe is leaking?

JustinR1979

FiremanDave wrote: »

Is tha because the down pipe is leaking?

I don't think so, shouldn't change the % content of what reaches the back.