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Failed MOT advice (Emissions)

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JamesV6CDX:
Very pleased with the MOT result. I expected a fail , and there were very few items in the list:

Exhaust has a major leak of exhaust gases (7.1.2) - expected

Exhaust emissions hydrocarbon content after 2nd fast idle excessive (7.3.D.3)

Nearside Front Lower Front suspension has excessive play in a lower suspension ball joint (2.5.B.1a) - Easy

Offside Front Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (4.1.D.1a) - Easy


My question is - emissions?

Would the holed mid section in the exhaust cause this?

I thought with HC, it was usually unburnt fuel  :-\

aaronjb:
If the hole in the exhaust is before (or very close to) the primary O2 sensor then yes, as the O2 will read lean and the ECU will add ever more fuel (in reality making it run rich). If not then no, in fact it should make it look 'lean' on the emissions test (low lambda) but with normal HC & CO readings.

JamesV6CDX:
The reading was literally just out of spec

Tester insists it’s the exhaust :y

b4ndit:
I would agree it is the exhaust had it many times doing mot's changed/fixed leak and straight through :y

Kevin Wood:
I'd be surprised to see a HC failure due to a leak on an Omega unless the leak is pre-cat.

You never know, though.

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