Check Engine Light comes on with abrupt braking

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Oct 21, 2007 | 09:57 AM

pradeepp

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Joined: Feb 2007

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From: Chicago

99 ML 320 with 81,000 miles

Check Engine Light comes on with abrupt braking

Hello,
My check engine light comes on if I abruptly brake. Then it goes away after sometime (4-5 days). Any idea what could be wrong. I am planning to buy a code reader, any suggestions which one should I buy?

Thanks a bunch.

Oct 21, 2007 | 10:24 AM

E320Sport

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E320

Your typcial auto parts store should carry an OBD II scanner. These work on 1996 models and later. I used my scanner on my 02 E320. Works great.

Good luck

Nov 4, 2007 | 09:17 PM

pradeepp

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From: Chicago

99 ML 320 with 81,000 miles

I bought INNOVA reader and scanned the car (99 ML320). It gave read bunch of codes. Here are they:

P0100 - Mass or Volume airflow circuit
P0170 - Fuel Trim (Bank 1)
P0173 - Fuel Trim (Bank 2)
P0130 - O2 Circuit (Bank 1 Sensor 1)
10135 - O2 Heater Circuit (Bank 1 Sensor 1)

I just changes the plugs and fuel filter. Why would trim codes show up. Should I talk to dealer for this?

I want to know what can I fix myself. I am an engineer and have done some work on small motors.

If there are any procedures available please point me to them.

Thank you much.
Pradeep

Nov 5, 2007 | 09:31 AM

Mr Cheeks

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From: UK

01 ML320

those are MAF sensor codes so you might need a new MAF insert from germanstar maybe the MAF is causing your 02 sensors to throw codes. How is your truck running?

Nov 5, 2007 | 01:51 PM

pradeepp

Thread Starter

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Joined: Feb 2007

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From: Chicago

99 ML 320 with 81,000 miles

Hello,

Truck is running fine with a bit of power loss periodically. I an just concernt hat it might cause damage to other parts in the system.

I asked the local dealership to change it. They are charging $675 to replace it.

I have recently changed spark plugs and fuel filter.

thanks
Pradeep

Nov 13, 2007 | 03:06 PM

mlfun

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MAF is sub $200 and takes 5 min to replace.

Nov 14, 2007 | 07:16 PM

jbowen1094

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Joined: Aug 2007

Posts: 39

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2001 CLK 55

What about a vacuum leak?

Check your vaccum lines going to the intake.

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Nov 19, 2007 | 11:45 AM

Mr Cheeks

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From: UK

01 ML320

Sometimes cleaning the MAF helps but usually the codes come back so its best to change the MAF insert which can be obtained from Germanstar

Apr 7, 2008 | 11:45 AM

#10

pradeepp

Thread Starter

Newbie

Joined: Feb 2007

Posts: 11

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From: Chicago

99 ML 320 with 81,000 miles

Hello,

I finally chnaged the MAF sensor and the fuel trim code are still there. I am guessing that it is some leak somewhere. Is my understanding right?

thanks
Pradeepp

Jul 8, 2008 | 11:07 AM

#11

pradeepp

Thread Starter

Newbie

Joined: Feb 2007

Posts: 11

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From: Chicago

99 ML 320 with 81,000 miles

I finally chnaged the MAF sensor got it from autohausaz for 173. Installed it and drove about 60 miles and CE light turned off. After 5-6 day of driving CE light came back on. I drove it another day and accelerated/floored the car while ideling for 5 6 secs cos I was mad. Then I turned it off and called it a day. In the morning CE light did not come on. But now I feel a bit loss of power.

Can someone please suggest what can I do to improve the feel of acceleration.