MOT emissions fail

V · 13th April 2015, 12:50 PM

I haven't used the Supe for a few months now (as we had our drive done which took months due to a couple of problems but anyway), but I did let the car idle 15 minutes now and then.

Just took it for an MOT and they've just called to say its failing he emissions which its always passed no problems whatsoever.

Its fully de-catted but they put no.2 back on for the test.
I haven't got the first CAT.

Its CO reading is 7.8% and I need 0.03% so its way off.

Any thoughts of a sudden failure please?

Car starts instantly and runs great still.

Thank you.

V · 13th April 2015, 01:00 PM

I was assuming its Oxygen sensor, but didn't know if there was a way of easily telling if that was the problem?

V · 13th April 2015, 01:26 PM

Plumping for a new 02 sensor.

Martin F · 13th April 2015, 09:35 PM

It could be the O2 sensor.

Did they give you a Lambda value ?

V · 14th April 2015, 07:57 AM

Hi Martin,

Lambda was ok (but I don't have the value).

BUT, it looks like its the bloody test centres equipment!!

They had 3 cars fail one after each other, and then thought it might be their machine which was faulty as they just had their sensor replaced.
They changed their sensor for another new one and hey presto, they all passed!

Mines getting done again this morning!!
A right PITA.

V · 14th April 2015, 12:19 PM

Err, not good news. Still not passing.

CO: 0.776 (need 0.3) - not 7.8% as they originally said!
Lambda: 1.029 (pass)
Hydrocarbon: 44 (pass)

They cant find any air leaks.

I've asked them to check the 02 sensor, but do think that's probably the culprit?

Martin F · 14th April 2015, 06:54 PM

It could still be the O2 sensor, especially if you haven't driven it much recently.

However before you do that it'd take the car for a hard drive to get the CAT nice and hot then drive in and get them to test it straight away. They should realise the CATs need to be hot to work properly, but in a garage which is busy it can be that your car was sitting for a while before they tested it.

V · 14th April 2015, 07:10 PM

He's given it a 'thorough' warming up session and driven straight in with the MOT waiting with his probe, but still movement on the reading whatsoever. Plumped for the O2 sensors so should find out tomorrow. Fingers crossed.
Cheers Martín

V · 15th April 2015, 04:48 PM

It was the senor that was knackered!

Martin F · 15th April 2015, 08:39 PM

Good News !!

How much was the sensor, if you don't mind ?

13th April 2015, 12:50 PM	#1
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	MOT emissions fail I haven't used the Supe for a few months now (as we had our drive done which took months due to a couple of problems but anyway), but I did let the car idle 15 minutes now and then. Just took it for an MOT and they've just called to say its failing he emissions which its always passed no problems whatsoever. Its fully de-catted but they put no.2 back on for the test. I haven't got the first CAT. Its CO reading is 7.8% and I need 0.03% so its way off. Any thoughts of a sudden failure please? Car starts instantly and runs great still. Thank you. __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

13th April 2015, 01:00 PM	#2
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	I was assuming its Oxygen sensor, but didn't know if there was a way of easily telling if that was the problem? __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

13th April 2015, 01:26 PM	#3
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	Plumping for a new 02 sensor. __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

13th April 2015, 09:35 PM	#4
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	It could be the O2 sensor. Did they give you a Lambda value ? __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

14th April 2015, 07:57 AM	#5
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	Hi Martin, Lambda was ok (but I don't have the value). BUT, it looks like its the bloody test centres equipment!! They had 3 cars fail one after each other, and then thought it might be their machine which was faulty as they just had their sensor replaced. They changed their sensor for another new one and hey presto, they all passed! Mines getting done again this morning!! A right PITA. __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

14th April 2015, 12:19 PM	#6
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	Err, not good news. Still not passing. CO: 0.776 (need 0.3) - not 7.8% as they originally said! Lambda: 1.029 (pass) Hydrocarbon: 44 (pass) They cant find any air leaks. I've asked them to check the 02 sensor, but do think that's probably the culprit? __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell. Last edited by V; 14th April 2015 at 12:25 PM.

14th April 2015, 06:54 PM	#7
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	It could still be the O2 sensor, especially if you haven't driven it much recently. However before you do that it'd take the car for a hard drive to get the CAT nice and hot then drive in and get them to test it straight away. They should realise the CATs need to be hot to work properly, but in a garage which is busy it can be that your car was sitting for a while before they tested it. __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

14th April 2015, 07:10 PM	#8
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	He's given it a 'thorough' warming up session and driven straight in with the MOT waiting with his probe, but still movement on the reading whatsoever. Plumped for the O2 sensors so should find out tomorrow. Fingers crossed. Cheers Martín __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

15th April 2015, 04:48 PM	#9
V Club Administrator Jap Spec RZ-S - Manual Join Date: Mar 2004 Location: Suffolk Posts: 584	It was the senor that was knackered! __________________ TT, VVTI, 6sp, HA's, SSQV, HIDS, K&N, N1 ExTi, AVS, Abflug, RMM, Defi, RPS, Turbo XS, ALC OS, DBA, Innovate. all wrapped in a blue shell.

15th April 2015, 08:39 PM	#10
Martin F Administrator UK Spec - Manual Join Date: Aug 2003 Location: Essex, UK Posts: 10,226	Good News !! How much was the sensor, if you don't mind ? __________________ Martin UK6TT + Bits & Bobs 'Remember folks, the inside lane isn't just for Xmas' MSOC FAQ MSOC Members Discounts MSOC Resources

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