Front oxygen sensor code. Check the vacuum line to the fuel pressure regulator and make sure it is ok before you replace the sensor. Any vacuum leak can also cause the code.
SOURCE: Pulled Codes Volvo 1995 850 Need Help
I would lean toward the MAF sensor they were known for going bad, which would cause all these codes. It wouldn't hurt to take the IAC off and spray it out with carb cleaner and some WD40, just to cover your bases. Both these units were made by Bosch and the MAF failed alot more often then the IAC.
SOURCE: 96 volvo 850 speedometer somtimes works then it drops to 0
Two questions: Is your odometer working? If not then it's probably a broken gear by the stepper motor that Emissionwiz mentioned. Is your ABS and/or TRACS light on intermittently or constantly. If so that is a common sign your ABS control module has gone or is going bad. This usually happens before the speedometer starts acting up. Either one of these will start intermittently and finally end up with the speedometer not functioning at all, and both are pretty common failures with this model.
SOURCE: I had to replace battery in 95 Volvo 850 Wagon,
yes volvo dealer or audio specialist who will be able to de code it for you
SOURCE: how do you replace o2 sensor in volvo 850..by the
an o2 sensor is near the catalytic. converter on the exhaust either right before it or right behind it. you can use a wrench, probably going to be larger than a 13-15mm wrench. they unscrew out of the exhaust tube and disconnect from a main line. take them out, and re connect the new ones. let me know how it works!
SOURCE: replace brake light 850 volvo wagon
It is really easy, and requires no tools. There is a flush panel inside the car behind the lights, using fingernails pry it off, then all the bulbs are visible and quickly changed out.
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