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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-10-2014, 11:34 PM   #1
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Join Date: May 2014
Location: Melbourne
Posts: 94
My Ride: 2002' Imola M3 SMG
Got INPa working and got some codes

Hey Guys,

Got an 2002 E46 M3 and I have noticed some hesitation at part throttle, which to my mind indicates closed-loop issue, I am relatively new to the car however, I ran a code check on the engine and got the following

Error #144 Lambda regulator 1 . I haven't seen any MAF errors, the car is running slightly rough at idle.

Does this point to the pre-cat o2 sensor for banks 1 - 3 needing to be replaced ? Should I check anything else ?

I thought it might have been unmetered air however there is no MAF errors so far.
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Old 08-11-2014, 03:47 AM   #2
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Join Date: May 2014
Location: Melbourne
Posts: 94
My Ride: 2002' Imola M3 SMG
So, I did a re-scan today and there weren't any codes yet.

I tried to use carby clean to listen to the engine while spraying over the intake manifold to see if I could hear a change. It's not really the best way I guess, I do have a custom pressure valve from my Forester that I can use to check the intake manifold is holding pressure but I wouldn't be sure if the same would apply to a NA car to a turbo forester ?

I also have a party smoke machine I could hook up somehow is that the same as the engine smoke machines I've seen used to do the same thing ?

Last edited by qsilver_za; 08-11-2014 at 03:48 AM.
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Old 08-11-2014, 08:28 AM   #3
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Location: Miami, Florida
Posts: 937
My Ride: M-3 Convertible
If you re-set the codes when you first checked, and the problem is in fact the front pre-catalysts (which I am not sure is correct), the code will not trip again until after between 5 and 12 driving cycles.
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