C32 failing emissions test

Hjartarson · 04-23-2012, 08:38 PM

Hi all,

I'm having some issues renewing my license plates. The process requires a tailpipe reading at idle RPM and another at ca 2000 RPM. My car is failing these tests miserably. The readings show about 4.5% co2 in both tests, but it should be <0.5%.

I've replaced the spark plugs and wires, as well as the upper oxygen sensors. I've taken the car to 2 different mechanics and they are both baffled. The car throws no emission related codes at all. The cats are fine according to the official inspectors.

I tried the search function, but I didn't find anything useful. Has anyone encountered this problem?

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gt4awd · 04-24-2012, 12:28 AM

Do you have it tuned? Maybe running rich is causing the issue. I would also find a different emissions shop to test again.

Hjartarson · 04-24-2012, 06:33 AM

Quote:

Originally Posted by gt4awd

Do you have it tuned? Maybe running rich is causing the issue. I would also find a different emissions shop to test again.

It's stock and the emissions have been tested in 3 different places.

gt4awd · 04-24-2012, 08:26 AM

Right away would assume it's the catalytic converters. I know the mechanics said it's not but how did they diagnose that? You can't always trust the opinion of a mechanic... How many miles does your C32 have?

Hjartarson · 04-24-2012, 10:58 AM

Quote:

Originally Posted by gt4awd

Right away would assume it's the catalytic converters. I know the mechanics said it's not but how did they diagnose that? You can't always trust the opinion of a mechanic... How many miles does your C32 have?

I'm not sure how they diagnosed it, but the official state inspectors said that the cats were ok. Car has 80k miles.

Zeppelin · 04-24-2012, 12:52 PM

You must mean your CO% was at 4.5, not the CO2. As the CO2 should be in the 5-15% range.

Only time I have had my CO% higher than like 0.6% is when I had a bad Cat Converter on my Honda. It also had sky high HC. Not saying that is it but there is a test they can run to see if it is a bad Cat.

evanoel · 11-22-2012, 01:12 AM

Hi Hjartarson,

I have exactly the same problem:
- failing emissions test
- No code on the OBD
Did you find a solution to your problem?

Thanks!

04-24-2012, 12:28 AM	#2
gt4awd MBWorld Fanatic! Garage is empty, add now Join Date: Sep 2008 Posts: 1,034 Drives: 2005 Pontiac GTO 6.0 LS2 - Blue	Do you have it tuned? Maybe running rich is causing the issue. I would also find a different emissions shop to test again. __________________ SOLD 2002 C32 AMG Sedan [132,000 Miles] Clear Side Markers \| CL Style Grille \| Flat Emblem \| CF Front Lip Spoiler \| CF Rear Diffuser \| CF Trunk Spoiler K&N Air Filters \| NGK IX (2 Step) \| KV-85 \| 185MM EUROCHARGED \| TVT Thermostat \| PSK Belt Wrap Johnson CM30 \| DIY Intercooler Isolation \| 26x7x2 FB H/E \| A/F & PSI Pillar

04-24-2012, 08:26 AM	#4
gt4awd MBWorld Fanatic! Garage is empty, add now Join Date: Sep 2008 Posts: 1,034 Drives: 2005 Pontiac GTO 6.0 LS2 - Blue	Right away would assume it's the catalytic converters. I know the mechanics said it's not but how did they diagnose that? You can't always trust the opinion of a mechanic... How many miles does your C32 have? __________________ SOLD 2002 C32 AMG Sedan [132,000 Miles] Clear Side Markers \| CL Style Grille \| Flat Emblem \| CF Front Lip Spoiler \| CF Rear Diffuser \| CF Trunk Spoiler K&N Air Filters \| NGK IX (2 Step) \| KV-85 \| 185MM EUROCHARGED \| TVT Thermostat \| PSK Belt Wrap Johnson CM30 \| DIY Intercooler Isolation \| 26x7x2 FB H/E \| A/F & PSI Pillar

11-22-2012, 01:12 AM	#7
evanoel Newbie Garage is empty, add now Join Date: Dec 2010 Posts: 1 Drives: c32 amg	Some news Hi Hjartarson, I have exactly the same problem: - failing emissions test - No code on the OBD Did you find a solution to your problem? Thanks!

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04-24-2012, 12:52 PM	#6
Zeppelin MBWorld Fanatic! Garage is empty, add now Join Date: Nov 2001 Location: OC Posts: 1,262 Drives: C32	You must mean your CO% was at 4.5, not the CO2. As the CO2 should be in the 5-15% range. Only time I have had my CO% higher than like 0.6% is when I had a bad Cat Converter on my Honda. It also had sky high HC. Not saying that is it but there is a test they can run to see if it is a bad Cat.

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