NCT failure on emissions 2004 Focus 1.4 petrol

Earthling7 · 02-06-2018 01:04PM #1

Could anyone help me to diagnose the above, it's failed on both low and high idle test with the following numbers:

Low idle:
CO 0.79% Vol (above 0.30% fail)
HC 240ppm

High idle:
Lambda: 1.02 (pass, between 0.97 and 1.03)
CO 0.80% vol (above 0.20% fail)
HC 238ppm (above 200ppm, fail)

The choke warning light has perpetually been on on this car (or is it the Lambda sensor light?)

Car had a new catalytic converter fitted about 6 years ago. Mileage is currently at 186k miles.

There are no untoward sounds coming out of the exhaust, so I don't think the exhaust is leaking.

Could this be a simple fix like a bottle of Dipetane, or else a new Catalytic converter?

any help appreciated, thanks

Leonard Hofstadter · 02-06-2018 02:19PM

It won't be the choke light because petrol cars haven't had those for the past 25 years at least. It's the engine malfunction light that's on. This comes in when there is a problem with the exhaust emissions (as your NCT results show). Get it scanned and see what the codes are.

SCOOP 64 · 02-06-2018 02:26PM

Don't think it will be a leak in exhaust as it passed Lambda.

Leonard Hofstadter · 03-06-2018 09:16AM

SCOOP 64 wrote: »

Don't think it will be a leak in exhaust as it passed Lambda.

Could be a small leak as it's running a bit lean.

I would say it's the catalytic converter but the truth is the OP needs to get a garage to scan the car for fault codes (the engine light is on), none of us know for certain until we see what the fault codes are.

ayux4rj6zql2ph · 03-06-2018 09:27AM

This post has been deleted.

Diabhalta · 03-06-2018 10:38AM

Dipetane.

Leonard Hofstadter · 03-06-2018 02:34PM

Diabhalta wrote: »

Dipetane.

No. Just no.

ayux4rj6zql2ph · 03-06-2018 05:46PM

This post has been deleted.

mullingar · 03-06-2018 08:10PM

It's running Way too rich.

Could be as simple as a vacuum leak or a blocked air filter

NCT failure on emissions 2004 Focus 1.4 petrol

Comments