Failed MOT

This never ends well · 17 Nov 2015 at 16:27

Took my card for a MOT but failed on.

Exhaust emissions carbon monoxide content at idle excessive 7.3.d.4
Exhaust emissions carbon monoxide content after 2nd fast idle excessive 7.3.d.3
Exhaust emissions hydrocarbon content after 2nd fast idle excessive 7.3.d.3 Exhaust emissions lambda reading after 2nd fast idle outside specified limits 7.3.d.3

What the hell do i need to fix as the MOT bloke, never told me what needs to be fixed, so the car can pass.

tom_e · 17 Nov 2015 at 16:29

You need to fix that list of things, if you don't know how then take it to a garage and tell them what it failed on.

Mr Badger · 17 Nov 2015 at 16:30

Download some of that Volkswagen software to fix it.

MooMoo444 · 17 Nov 2015 at 16:32

'MOT bloke' can only speculate what is causing the faults. He's just testing the car and it's failing on those points. He can't tell you there and then what is causing that fault. Could be that the guy giving you pointers on what it would be would open them up to liability if that didn't fix it.

Go to a garage and mention the points in your OP, they'll better guide you.

Maccy · 17 Nov 2015 at 16:35

Not possible to fully diagnose just by posting on here what it failed on. It could be a simple lambda sensor needs replacing, or the cat needs replacing or something greater.

As said, take it to a garage if you're unsure and get it sorted.

iaind · 17 Nov 2015 at 16:46

You could at least tell us what car it is - at least give us a fighting chance

craig_t · 17 Nov 2015 at 17:21

Might be the flux capacitor or the waffle sprocket?

pepsilol · 17 Nov 2015 at 17:28

jamiehard1989 said:
Took my card for a MOT but failed on.

Exhaust emissions carbon monoxide content at idle excessive 7.3.d.4
Exhaust emissions carbon monoxide content after 2nd fast idle excessive 7.3.d.3
Exhaust emissions hydrocarbon content after 2nd fast idle excessive 7.3.d.3 Exhaust emissions lambda reading after 2nd fast idle outside specified limits 7.3.d.3

What the hell do i need to fix as the MOT bloke, never told me what needs to be fixed, so the car can pass.

Crack in the exhaust.

This never ends well · 17 Nov 2015 at 18:53

Car is a 306 1999 with 136k on the clock.

I will take it tomorrow even know a garage likes to rip people of.

Hope it just the cat and not the whole exhaust system.

Diddums · 17 Nov 2015 at 19:07

pepsilol said:
Crack in the exhaust.

Don't be silly, lambda sensor.

leigh_boy · 17 Nov 2015 at 19:29

Diddums said:
Don't be silly, lambda sensor.

or CAT

Amos91 · 17 Nov 2015 at 20:13

Post you're actual readings.

This never ends well · 17 Nov 2015 at 21:48

Amos91 said:
Post you're actual readings.

Yeah i will when i get home tomorrow.

This never ends well · 18 Nov 2015 at 08:55

Amos91 · 18 Nov 2015 at 10:22

That will be the pre-cat lambda.

This never ends well · 18 Nov 2015 at 10:46

Amos91 said:
That will be the pre-cat lambda.

OK so i need to get a new cat and a lambda ?

lemonade · 18 Nov 2015 at 11:25

You can try by changing the bank 1 lambda sensor first, which is usually located on the manifold area, that is the pre-cat sensor. If that don't fix then just get a cheap cat and a new sensor.

Amos91 · 18 Nov 2015 at 11:26

jamiehard1989 said:
OK so i need to get a new cat and a lambda ?

Just lambda. Garage should plug it into some diagnostics to check if the sensor is operating correctly.

I've had similar readings and just changing the lambda fixed it.

This never ends well · 18 Nov 2015 at 11:36

I cannot drive the car anymore as i realized the mot run out on the 9th.

I will see if i can get someone to come out to do a diagnostic check.

If its just lambda, i would need to get a new downpipe aswell, as i know the lambda looks all rusty and welded on to the exhaust.

lemonade · 18 Nov 2015 at 11:46

Pretty sure you can drive around for 7 days whilst you get car fixed for retest.