On 10/10/2019 11:21, Dave Plowman (News) wrote:
In article ,
The Natural Philosopher wrote:
Seems that the front cat (there are two) is blocked so the
exhaust is blowing back into the engine, out though manifold
gaskets, etc. engine management light is on, there is oil and
crap everywhere under the bonnet, and vehicle only
goes up a hill in 1st gear.

That is not an MOT failure
MOT id concerned with safety.
And emissions at the exhaust.
Not emissions from the manifld

Love to know how you could have emissions within tolerance with a blocked
cat. And that's what the engine management light is telling you.


Its failed because the light is on.
It doesn't actually matter why its on, it fails if the warning lights do
no behave as though there is no fault.
This usually means they come on when you turn the ignition on and go out
after the car is started and may involve pressing the brake pedal to
check the switch.
This is why a failed warning lamp can be a fail.
I don't know what they do in a car with computer display of faults and
warning lights if they disagree but its probably a fail.