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post #11 of 54 (permalink) Old 08-09-2008, 01:27 PM Thread Starter
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Ok, I pulled P0141 which is an O2 sensor. Could this cause the slowness?

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post #12 of 54 (permalink) Old 08-09-2008, 01:31 PM Thread Starter
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Found this on the web.


The HEATER CIRCUIT MALFUNCTION error means that the built-in heater inside
the sensor has failed. The only recovery from this is to replace the
affected sensor. Having said that, this is not an error that should result
in your car shutting down.

The sensor works when it has reached a certain temp. This temp will easily
be reached through the passing of the exhaust stream, but the rise-time is
too slow. The computer wants to see a valid input faster than exhaust stream
will heat the sensor -- the problem here is that the sensor is needed to
reduce smog, and a cold sensor will not reduce smog so they heat it by
internal means to get it to work. The internal heater is broken.

Neither code you reported should shut the car down. Of the two, the second
might result in the car reverting to Limp Mode, where it runs crappy -- and
rich (too much gas is fed).

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post #13 of 54 (permalink) Old 08-09-2008, 01:33 PM
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Originally Posted by ThrillKill View Post
Ok, I pulled P0141 which is an O2 sensor. Could this cause the slowness?
I think that is your MAF, and yes it can cause slowness--and worse. It also could be cat-related but I think it more likely a dirty/bad air flow sensor. If you follow the MBSearch threads you will see it is probably a relatively easy fix. They say it's a DIY, but I have my dealer do it.

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post #14 of 54 (permalink) Old 08-09-2008, 01:38 PM
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Originally Posted by ThrillKill View Post
Found this on the web.


The HEATER CIRCUIT MALFUNCTION error means that the built-in heater inside
the sensor has failed. The only recovery from this is to replace the
affected sensor. Having said that, this is not an error that should result
in your car shutting down.

The sensor works when it has reached a certain temp. This temp will easily
be reached through the passing of the exhaust stream, but the rise-time is
too slow. The computer wants to see a valid input faster than exhaust stream
will heat the sensor -- the problem here is that the sensor is needed to
reduce smog, and a cold sensor will not reduce smog so they heat it by
internal means to get it to work. The internal heater is broken.

Neither code you reported should shut the car down. Of the two, the second
might result in the car reverting to Limp Mode, where it runs crappy -- and
rich (too much gas is fed).
Those codes are notoriously unreliable and often erroneous. It is kind of like a CEL: It can mean almost anything. See if your dealer will give you a professional reading. Should be free I believe...

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post #15 of 54 (permalink) Old 08-09-2008, 01:42 PM Thread Starter
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Well I've changed out the MAF on the ML. In a very tight spot but doable. The thing is I just recently checked all my cars for codes 2 weeks ago when I was working on the ML and came up with nothing so this seems to be very related. Plus it is even showing me which bank and what sensor.

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post #16 of 54 (permalink) Old 08-09-2008, 01:51 PM
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Let us know what you do and what happens... I'm curious. Do you have a lot of particulate matter in the air where you drive and/or park your cars?

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post #17 of 54 (permalink) Old 08-09-2008, 01:57 PM Thread Starter
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No, not really. I put only about 30 miles on it per week and this happened all of a sudden. There was absolutely no performance issue prior to this.

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post #18 of 54 (permalink) Old 08-09-2008, 02:04 PM
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Strange... But our cars have a nasty habit of crapping-out when left to sit for more than a few days.

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Last edited by Jayhawk; 08-09-2008 at 02:06 PM.
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post #19 of 54 (permalink) Old 08-09-2008, 02:04 PM Thread Starter
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Dealer wanted double for what I can get it for at NAPA. Darn crooks.

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post #20 of 54 (permalink) Old 08-09-2008, 02:24 PM
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A guy over at MBCA has the same issue: SLK Hesitation - Mercedes-Benz Club of America Forums Except he pulled P0170...

You might want to see what he does...

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