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ML350 03, oxygen sensors replaced, odb2 resets and shows same code to replace O2

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Old Aug 30, 2013 | 02:21 PM
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popka1234567890's Avatar
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ml350
ML350 03, oxygen sensors replaced, odb2 resets and shows same code to replace O2

Connected OBD2 got code to replace all 4 O2 sensors.
Replaced with Bosch.
Connected OBD2 to reset codes, it did then Check engine light went on again.
Connected OBD2, it gave same codes to replace 4 O2 sensors.
Am i missing something to replace, like a fuse?
Maybe OBD2 acts up? Is there a designated OBD2 for mercedes or any ODB2 reader works?
I have a typical 15$ OBD2 reader usb cable and soft on laptop.

Any ideas, anyone?

thanks for reading
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Old Aug 31, 2013 | 04:51 AM
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Maj. Dundee's Avatar
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2002 ML 320 & 2006 ML500
What are the code numbers, e.g. P0xxx? I'll bet that they are all O2 heater codes which would mean that you must replace fuse #19.
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Old Sep 8, 2013 | 12:20 PM
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P0412 secondary air injection system switching valve a circuit malfunction
p0444 Evaporative emission control system purge control valve circuit open
p0403 Exhaust gas recirculation circuit malfunction
p0135 Oxygen Sensor Heater circuit malfunction (bank 1 sensor 1)
p0155 Oxygen Sensor Heater circuit malfunction (bank 2 sensor 1)
p0141 Oxygen Sensor Heater circuit malfunction (bank 1 sensor 2)
p0161 Oxygen Sensor Heater circuit malfunction (bank 2 sensor 2)
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Old Sep 10, 2013 | 12:40 AM
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checked fuse #19, it was MISSING
Any how, put in a new 15amp fuse as required, reset codes via obd2 and the check engine light did not come up any more- problem solved. Thank you for reading and pointing me in the right direction.
strange as i bought the car with out check engine light on. Maybe it is possible to "silence" check engine light on a individual errors with advanced obd2 software?
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Old Sep 29, 2018 | 12:19 AM
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2001 S500, 2003 SL500, 2007 S550
Exact same problem im having going to check fuses in the AM.
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Old Jun 24, 2021 | 04:16 PM
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Mercedes CLK 320 W208
What would be the fuse number for the exact problem, but in a CLK 320 W208 ?

I currently have exactly the same problem in a CLK 320 W208 from 11/1999:

P0135: O2 Sensor Heater Circuit (Bank 1 Sensor 1)
P0141: O2 Sensor Heater Circuit (Bank 1 Sensor 2)
P0155: O2 Sensor Heater Circuit (Bank 2 Sensor 1)
P0161: O2 Sensor Heater Circuit (Bank 2 Sensor 2)
P0443: Evaporative Emission Control System Purge Control Valve Circuit

, so if anyone could tell me the corresponding fuse number(s) on my car, that would be really great. Many thanks in advance.
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