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Old 04-28-2013, 04:59 AM   #1
Peture
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Join Date: Jan 2008
Location: Norwich, UK
Posts: 1
My Ride: 3-Series E46 3.18
CO to high on MOT

Hi guys, failed the mot on the CO fast-idle test. Results:

Fast Idle Test
CO: 0.56% [limits: 0.30%] (failed)
HC: 45ppm [limits: 200ppm]
Lambda: 1.01 [limits: 0.97-1.03]

Natural Idle Test
CO: 0.03% [limits: 0.50%]

Given its only the CO that failed and is not too high, what could this be?


Work done -
new crankcase breather hose
new crankcase breather valve
cleaned MAF
new exhaust gasket
checked for leaks, etc.

I do have an error code: 165 katalysatorkonvertierung

This may be the original CAT, so about 12 years old. Could this be the issue?
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Old 02-06-2017, 04:34 PM   #2
3eeighteen
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Join Date: Aug 2016
Location: UK
Posts: 1
My Ride: 318ci M Sport
Hi Peture,
Did you get to the bottom of your issue?

I had my engine remanufactured and the cat replaced last year however I get a similar problem (with engine light on) on my 318ci 2004.

I am not sure if the after market kat is already gone.

3eeighteen
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