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Old 10-10-2010, 12:45 AM
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Join Date: Dec 2003
Location: new jersey
Posts: 181
Can O2 sensor be cleaned?

Car: 1995 E320 with 216K miles.
I suspect the car has been running rich and the O2 sensor may have carbon build up. I want to clean the O2 sensor, perhaps with brake cleaner?
Anyone have success doing this?

I've been having idle surge problems.
Codes on module used to regularly come up as 4 & 26 which my indie informed was due to upshift delay area and not worth fixing.
Recently I got code 10.
Pin 14 came up clean. Pin 8 came up with fault code 4 & 13.
I Cleaned MAF, idle surge became slightly less severe.
I Cleaned EGR tube, no noticeable change.
I cleaned Cleaned Throttle body plate, very minor improvement.
Checked for Vacuum leaks, no noticeable change.
I can't find the fuel pressure regulator to check is fuel leaking when vacuu line is pulled off. If anyone can give me a clue?
Cleaned purge valve. At first minute the idle was still surging but it quickly impoved and after a 10 mile drive surge was gone.
The idle has gotten better but not quite 100% yet.
Which I think is due to the oxygen sensor being gunked up.

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Old 10-10-2010, 01:14 AM
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Join Date: Jun 2006
Location: Chandler, Arizona
Posts: 3,523
Probe the sensor first via the passenger carpet. This at the very least will give you an idea if either A) the sensor is refreshing fast enough or B) Your mixture is messed up.
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Old 10-10-2010, 01:42 PM
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Join Date: May 2009
Posts: 398
Yes it can be cleaned but the process I haved seen involves a torch as it takes more heat to clean than it took to create in the exhaust.
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Old 10-13-2010, 01:39 PM
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'94 S500: only 793 sold!
Join Date: Mar 2001
Location: San Diego, CA
Posts: 1,933
Originally Posted by tan man View Post
Car: 1995 E320 with 216K miles.
I suspect the car has been running rich and the O2 sensor may have carbon build up.

I've been having idle surge problems. I Cleaned MAF, idle surge became slightly less severe.
Typically, a bad MAF causes this . . . found that the "hot-film" versions do not 'clean' as well as the "hot-wire". Try replacing it with a known good MAF and see what happens.

Regards . . . . JimF
'94 S500 Cpe

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