The oxygen sensors are on the exhaust pipes in front and behind the catalytic converter(s). Bank two is the side with cylinder number 2, and sensor one is in front of the cat.
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Vacuum leak, oxygen sensor or possible bad air mass sensor. Disconnect the mass air flow sensor and it will go to a default but stay running. If not try disconnecting the oxygen sensor and see if it stays running.
Po133 is and oxygen sensor code. Replace the front oxygen sensor use a bosch or OE sensor only. P0442 is and evap system leak. Most common fault is a cracked hose at the evap cannister at the right rear of the car.
The oxygen sensors are on the exhaust pipes in front and behind the catalytic converter(s). Bank two is the side with cylinder number 2, and sensor one is in front of the cat.
with the little research i've done including looking up the part. which only lists one being before the catyilitic converter (uptream) and the fact that your car being 1994 with obd I emission controls (obd II reqiures two - 1 upstream and 1 downsteam), i'm making an educated guess that it only has one O2 sensor
If the fault code relates to the oxygen sensors, make sure that they used Volvo factory sensors. The aftermarket sensors (even Bosch) have not worked well in the S80s. Also, make sure the catalytic converter is not causing the problem (the rear oxygen sensor monitors the cat).
Possible Solutions
The simplest thing to do is to reset the code and see if it comes back.
If the code comes back, the problem is more than likely the front Bank 1 oxygen sensor. You will likely wind up replacing it but you should also consider these possible solutions:
Check and fix any exhaust leaks
Check for wiring problems (shorted, frayed wires)
Check the frequency and amplitude of the oxygen sensor (advanced)
Check for a deteriorating / contaminated oxygen sensor, replace if necessary
Had a similar problem recently where I would press the accelerator almost to the floor before I got a response and when I ran the A/C it was worse. Also my car kept stalling out when at idle. Volvo dealerships are extremely expensive. I took mine to a Bosch service center (more of a mom & pop shop) and the price was more reasonable. The drivability (sp?) problem was the rear oxygen sensor for me. I also had a fuel pressure sensor and MAP (labeled as pressure sensor from Volvo) sensor replaced. The parts are expensive, but it fixed my issue. There is a front and rear oxygen sensor so it could be either. The parts are $219 each. The fuel pressure and MAP sensor are cheaper, but only by about $40. They are not hard to replace though. Once I had the rear oxygen sensor replaced the car was back to normal. I have a 2003 S60 with 97K miles.
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