ESP Error - C1142 - Mercedes-Benz Forum
 
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#1 (permalink) Old 10-14-2013, 08:15 AM
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ESP Error - C1142

Well, I finally built a system for reading diagnostic codes to track down my intermittent ESP errors. I cleared a bunch of old, stored codes which I don't think were helpful and drove until the error came back.

Scanned and got C1142 - Lateral acceleration sensor or micro mechanical turn rate and steering angle sensor. Open circuit, short circuit, voltage supply, plausibility. Verify tension at lateral acceleration sensor - ignition on 4.75 - 5.25 volts.

I cleaned the contacts on the sensor connector and tried again - same result.

With the car parked in the garage the ESP live data shows a good steering angle but the lateral acceleration shows about -140m/s2 while sitting still. Unfortunately I'm using a desktop system in my garage so I can't actually drive and capture more results.

From this I think it's safe to say I need a new lateral acceleration sensor.

But how does one check the voltage on that? Do you just pull the harness and measure between the pins? Which pins should have 5 volts? Or does sensor need to be connected with something special so you can measure the voltage while the connector is on the sensor?
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#2 (permalink) Old 10-14-2013, 06:35 PM
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The official procedure is to connect the diagnostic socket box to the engine bay wiring harness. Here's what you need:

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Of course I am guessing you aren't going to buy that, so as an alternate, you test the voltage but you have to do it with the wiring harness in place, so you need to slide small probed into the connector at the sensor. My guess is that's it's just a bad sensor.

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#3 (permalink) Old 10-14-2013, 07:52 PM
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I think you're right. I'd love to have a tool like that but I won't be buying one at the moment.

I hate to throw parts at a problem when there are still tests that could be done but in this case I think the sensor is very likely the problem.
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#4 (permalink) Old 10-14-2013, 08:33 PM
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Definitely don't throw parts at this one:

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Yikes! Almost $500 discounted!

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#5 (permalink) Old 10-15-2013, 04:44 AM
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Go ahead and change the lateral acceleration sensor, most esp problems are related to that sensor. I'm sure you know it's mounted in the trunk behind the rear seat under a plastic panel. Got mine off ebay for 100.00 brand new, don't buy used!
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#6 (permalink) Old 10-15-2013, 07:12 PM
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My local self-service salvage yards almost never have any Mercedes, but I checked the recent arrivals on their web site and to my surprise they had a ML 320. I went to check it out at lunch and it had been there three weeks and the interior was pretty well stripped, but I dug around under the foam in the center console and found these:



Even better, they don't seem to have any category for ESP sensors, I guess since most of their cars are 10 to 15 year old domestics and things like Honda Civics where ESP wasn't common. So when they don't have a category for it they charge "Sensor, Misc - $3.99 each". So I paid $7.98 for both the yaw and lateral acceleration sensors.

I installed the lateral acceleration sensor and I've done three short trips and it seems to have shut up the ESP error. Yay. So far.

So it looks like I may have a spare yaw sensor now.

Last edited by 300DFan; 10-15-2013 at 08:51 PM.
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#7 (permalink) Old 10-15-2013, 08:49 PM
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Really cheap! It should be around $100+ for a new one.

Quote:
Originally Posted by 300DFan View Post
My local self-service salvage yards almost never have any Mercedes, but I checked the recent arrivals on their web site and to my surprise they had a ML 320. I wend to check it out at lunch and it had been there three weeks and the interior was pretty well stripped, but I dug around under the foam in the central console and found these:



Even better, they don't seem to have any category for ESP sensors, I guess since most of their cars are 10 to 15 year old domestics and things like Honda Civics where ESP wasn't common. So when they don't have a category for it they charge "Sensor, Misc - $3.99 each". So I paid $7.98 for both the yaw and lateral acceleration sensors.

I installed the lateral acceleration sensor and I've done three short trips and it seems to have shut up the ESP error. Yay. So far.

So it looks like I may have a spare yaw sensor now.
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#8 (permalink) Old 10-16-2013, 10:37 AM
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Originally Posted by vr2whf View Post
Really cheap! It should be around $100+ for a new one.
Those two sensors are over $600 for the two of them new. I'd guess these yards will update their prices eventually, but for now that's the place to get these parts if you're lucky enough to find them.

And ESP errors seems to be gone. That's been an irritating error that came on only rarely a year ago, but started appearing nearly constantly recently. Seems to be fixed for now. I wish I could fix more things like this for $3.99.
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