Adam1998
New Member
Can anyone tell me where the oxygen sensor is located on c320 CDI w204 2009 om642,and a replacement part number aswell please thanks.
Oxygen sensor
- Thread starter Adam1998
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W1ghty
MB Enthusiast
On the exhaust pipe next to the gearbox sump
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Adam1998
New Member
Thanks is that on the driver's side
W1ghty
MB Enthusiast
Yes I think it is but you will need the car up in the air to get to it with the underpanel off
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Adam1998
New Member
Not a problem thanks mate would u also have a part number handy or replacement
W1ghty
MB Enthusiast
It might be somewhere in this thread I did a few years ago (better double check it for your car though )
Oxygen sensor E320cdi , How many ?
Hi Folks , I've read a couple of fault codes with my icarsoft MBII , they relate to Oxygen sensors . P0030 HO2S Heater Control Bank 1 sensor 1 PO135 O2 sensor heater circuit bank1 sensor 1 PO130 O2 sensor circuit Bank 1 , Sensor 1 . I've done a bit of reading up and I reckon it is a heated...
forums.mercedesclub.org.uk
fyi I had a code for o2 sensor show up on star on a newly acquired om642 211 several years ago. The car was running well, had just passed an MOT and fuel consumption was good so I decided to leave well alone......seven years and 90,000 miles later it was just the same. The car flew through the emissions tests each year and fuel consumption was exactly where an om642 211 should be.
W1ghty
MB Enthusiast
Yep , they don’t make a great deal of difference on the om642 .
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Adam1998
New Member
my concern when I was accelerating I would have to put the boot down more on the gas pedal as it feel like there's something clogged that's why I thought O2 sensor would of played a part,as in sending the wrong fuel mixture and now the catalytic converter is clogged and maybe that's why I'm getting a clogged feeling when driving if that's makes sense.
Very unlikely to be the o2 sensor in my opinion. If I had to guess it would be turbo actuator or back pressure sensor or...... Honestly you will be wasting a lot of ££££ guessing; you need to get the car onto Star to see if there are any fault codes first. Some faults may not show a code but it is the only place to start.
W1ghty
MB Enthusiast
If you are at all handy you could buy an icarsoft MB2 second hand to look for fault codes.
Other than that some almost free diy jobs are to remove and spray clean the hole on the underside of the back pressure sensor …it can get clogged with gunk .
Remove and spray clean the turbo actuator and put a tiny bit of high temp grease on the worm gear .
Do the ”resistor fix” on the inlet port motor by installing a 4.7k ohm resistor (£1 for the resistor?)
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Adam1998
New Member
Thanks lads,better getting it on star or the icarsoftmb2,the back pressure sensor i think is good place to start,the tail pipes are pure black and its blowing abit of black smoke under heavy acceleration maybe the back pressure sensor is where the hesitation/clogged feeling is coming from,for me to drive normal it accelerates but then it has the clogged feeling then it will downshift,and then change gear then have the clogged feeling again
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Adam1998
New Member
Checked the back pressure sensor was abit of soot build up in the hole and the sensor give that a clean same problem persists,checked actuator arm should there be a rattle in the linkage or should it be a tight fit thanks.
