Fault Codes P0156 & P0161, O2 Sensor Help please - Mercedes-Benz Forum
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#1 (permalink) Old 11-10-2009, 12:26 PM
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Fault Codes P0156 & P0161, O2 Sensor Help please

Hi All,

Pulling up 2 codes after CE light.
P0156 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0161 O2 Heater Circuit Malfunction (Bank 2 Sensor 2)

Just wanted to make sure that I should just replace the O2 Sensor and if anyone knows what the part number is (and cheapest place on the net to buy it)

Thanks for any help, much appreciated! Need to get my emissions tested soon so I have to get this taken care of....

MY00 ML320
75Kmiles / Black Opal / M1 Package
Sunroof / Heated Seats / CD Changer
Mods: Front Plate delete / Badge delete /35% tint front windows / OEM Trailer Hitch / OEM Step Bars

MY97 Porsche Boxster
56Kmiles / Ocean Blue / Sport Package / Hard Top
Mods: B & M Short Shifter / MY00 Shift knob & boot / SS intake grills / Badge delete / front plate delete
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#2 (permalink) Old 11-10-2009, 12:47 PM
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autohausaz

Mike
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#3 (permalink) Old 11-10-2009, 06:43 PM
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Also try Amazon, surprisingly. Had good prices on Bosch sensors for my other car. But for most things I'll agree with Mike.
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#4 (permalink) Old 11-10-2009, 07:19 PM
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Currently suggested part number for 2000 MB ML320 is Bosch #13782 (www.bosch.com has that suggestion as well) . It is available also at Autozone, Advanced Auto Parts. I've got my last two at Advanced Auto Parts in Bridgeport, CT - they had them in stock - price under $100.00.

When removing old O2 sensors, try to be as careful and patient as you can. I've been both, and in spite of it, and using repeatedly /torch heat/ice cold/ cycles, combined with WD-40, I've damaged both "after the CAT" sensors - they were seized, and didn't come out, without leaving their threads inside the O2 sensor sockets. I am still working on repairing the O2 socket on the left CAT.

Last edited by mercbentz; 11-10-2009 at 07:22 PM.
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#5 (permalink) Old 11-11-2009, 08:06 AM
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But for most things I'll agree with Mike.
All right!!!!!

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#6 (permalink) Old 11-11-2009, 10:37 AM
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Thanks All for your help! I really appreciate it!

I found the sensor at mbpartswarehouse.com for $86.95 with free shipping just to let you know! Lowest price I could find on the internet and I scoured ebay, amazon & google. Less than Autohausaz and I have ordered from them before.

I hope I can remove and replace easily...but thanks for the warning!

MY00 ML320
75Kmiles / Black Opal / M1 Package
Sunroof / Heated Seats / CD Changer
Mods: Front Plate delete / Badge delete /35% tint front windows / OEM Trailer Hitch / OEM Step Bars

MY97 Porsche Boxster
56Kmiles / Ocean Blue / Sport Package / Hard Top
Mods: B & M Short Shifter / MY00 Shift knob & boot / SS intake grills / Badge delete / front plate delete
Track/AutoX Shoes: Kumho Victoracers
Street Shoes: Kumho Ecsta 712's
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#7 (permalink) Old 11-11-2009, 12:50 PM
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Quote:
Originally Posted by J-bird View Post
Thanks All for your help! I really appreciate it!

I found the sensor at mbpartswarehouse.com for $86.95 with free shipping just to let you know! Lowest price I could find on the internet and I scoured ebay, amazon & google. Less than Autohausaz and I have ordered from them before.

I hope I can remove and replace easily...but thanks for the warning!
AUtohausAZ has a "free shipping" if more than $50, if I recall correctly.

Furthermore, I've seen earlier today at Discount Catalytic Converters - Top Quality Catalytic Converters at pocket-friendly prices the BOSCH 13782 O2 sensors at $78.09.

Today, discussing with a mechanic, about my O2 sensor sockets, he told me he is heating the O2 sensor to "red" and removes them then, when they're soft.

Good luck with the project.
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#8 (permalink) Old 04-09-2010, 07:47 PM
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Originally Posted by J-bird View Post
Hi All,

Pulling up 2 codes after CE light.
P0156 O2 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0161 O2 Heater Circuit Malfunction (Bank 2 Sensor 2)

Just wanted to make sure that I should just replace the O2 Sensor and if anyone knows what the part number is (and cheapest place on the net to buy it)

Thanks for any help, much appreciated! Need to get my emissions tested soon so I have to get this taken care of....
I got the same codes today. Can someone tell me the original part numbers and where the sensor is located.

Thanks
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#9 (permalink) Old 04-09-2010, 08:55 PM
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The sensors screw in to the exhaust pipes around the first catalytic converter area of the pipe. You can see one or two of them behind the engine where the exhaust pipe is visible, the other ones are easy to to get to from under the car.

The info on the correct sensor is above, BOSCH 13782. I got mine from Autohausaz. Easy replacement, you'll simply need the correct sized wrench to back them out, might need a little force depending on how long they've been in there, unplug it from the clip that connects to it, put some seize on the new one, screw it in, plug it into the clip. Remove the battery cable for a few seconds, put it back on, and you should be set.

Last edited by Dan P; 04-09-2010 at 08:59 PM.
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#10 (permalink) Old 04-10-2010, 03:47 AM
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I got the same codes today. Can someone tell me the original part numbers and where the sensor is located.

Thanks

Bank 2, sensor 2, is G3/5 in the illustration.
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