1996 Volvo 850 Oxygen Sensors

1996 VOLVO 850
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YPEREZ3508
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Computer problem
1996 Volvo 850 Front Wheel Drive Automatic
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I have a Volvo 850 GLT. The Check Engine light keeps coming on. We have changed the Catalisy Converter and the Oxygen Sensor and it still comes on and will not pass emissions, does anyone know if there is a second oxygen sensor? We have had the car diagnosed after the oxygen sensor was changed and it keeps coming up stating that is the problem.
Aug 24, 2008 at 7:18 PM
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KHLOW2008
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Hi yperez3508,

There are 2 O2 sensors. In front of catalytic converter and after it.

What was the code that was retrived?

Did you check the wiring circuits?
Aug 29, 2008 at 7:15 AM
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YPEREZ3508
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The Code we received was a P0172 (or something like that) They also discussed a possible air flow problem as well as the Canister Purge Valve. I'm really confused! Now, my car is consuming so much gas, I'm almost broke. I'm wondering if anyone has experienced that same problem.
Aug 29, 2008 at 7:51 AM
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KHLOW2008
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Hi yperez3508,

P0172 = system too rich (Bank 1)

Too much fuel is getting to the cylinders. Check for faulty injectors.
Aug 29, 2008 at 10:04 AM