PO131 O2 low voltage,bank 1, sensor1, fault
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Newbie
Joined: Sep 2009
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2002 C230 Kompressor
PO131 O2 low voltage,bank 1, sensor1, fault
My generic reader shows a PO131, O2,low voltage, bank 1, sensor 1 Fault. I've remover the O2 sensor before the cat., cleaned the connectors, put it back and the code returrned. It appears it could be a multitude of causes in addition to the MAF which I removed and cleaned 2000 miles ago. That fault (PO101) has not returned. Has anyone been lucky enough to just change the O2 sensor and fix this fault?
Member
Joined: Nov 2007
Posts: 171
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From: ontario, Canada
C230 COUPE 2003 M271
My generic reader shows a PO131, O2,low voltage, bank 1, sensor 1 Fault. I've remover the O2 sensor before the cat., cleaned the connectors, put it back and the code returrned. It appears it could be a multitude of causes in addition to the MAF which I removed and cleaned 2000 miles ago. That fault (PO101) has not returned. Has anyone been lucky enough to just change the O2 sensor and fix this fault?
Super Moderator
Joined: Jun 2008
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
O2 sensors have a design life of about 80,000 miles before they cycle too slowly. They can also be poisened by the car ingesting silicone from silicone sprays etc which should never be used under hood.
I suggest you replace the sensor. Please only use genuine OE heated sensors - No generics even if they are Bosch. They don't work. This does not mean you have to buy from a dealer but from a reputable Benz Spares outlet.
I suggest you replace the sensor. Please only use genuine OE heated sensors - No generics even if they are Bosch. They don't work. This does not mean you have to buy from a dealer but from a reputable Benz Spares outlet.
Senior Member
Joined: May 2006
Posts: 268
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From: VA
2002 C320
O2 sensors have a design life of about 80,000 miles before they cycle too slowly. They can also be poisened by the car ingesting silicone from silicone sprays etc which should never be used under hood.
I suggest you replace the sensor. Please only use genuine OE heated sensors - No generics even if they are Bosch. They don't work. This does not mean you have to buy from a dealer but from a reputable Benz Spares outlet.
I suggest you replace the sensor. Please only use genuine OE heated sensors - No generics even if they are Bosch. They don't work. This does not mean you have to buy from a dealer but from a reputable Benz Spares outlet.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Glyn, why don't the generics work? My BMW mechanic buddy (who helps me with my MB frequently) told me there's no difference between the various O2 sensors as long as they are heated and that the extra money (assuming it's still Bosch) is just for the length of cable and plug. What's the deal?
I think that while in principle all O2 sensors operate the same way the Benz sensors have specifically profiled cycle times etc. and the Benz electronics are matched to this.
When Bosch makes a generic they have to broaden it's specs so that one size fits all - so to speak. You might well find that fuel trim & all is just fine with the generics but that they upset the diagnostics. Like changing the current draw of a headlight bulb does.
So having experienced trouble I always recommend against generics. In this country if you stay away from the dealers & buy the correct sensors direct from Bosch - there is virtually no price difference between the genuine article & a generic.
Member
Joined: Nov 2007
Posts: 171
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From: ontario, Canada
C230 COUPE 2003 M271
not worth risking it on universal o2 sensors. I went that route with my last car only to find that a few months later water leaked into the wiring and ruined it. Its not a lot of money extra to pay for something that is guaranteed to work perfectly and it saves you the labor of splicing and soldering wires and risking a failure.
