I have a CEL on my 2001 V70 Base NA. I pulled the codes and I'm getting P0442 and
P0420. Last year I replaced a downstream O2 Sensor to fix a light. Now this.If I clear them it takes a couple days to come back. Thanks for any help you folks can offer!

David C

Thanks so much. That makes sense.

The blower fan speed is wide open. I have to turn on the ignition key to make it stop. Good question about hot or cold. It did happen last winter too. My concern is that it doesn't stop on it's own like a timed cycle. It will continue running until switch is turned on, or the brand new battery dies....

This is not the radiator fan, that works normally. this is the heater/ac blower motor inside the car

My 2001 V70 sometimes I park the car and walk away and come back later to find the ac blower running at high speed. This is not the radiator fan, it’s the blower motor. Anyone experienced that, or have a clue what it might be? Twice it ran long enough to kill the battery!

Thanks for all of your help! Shorted battery. Replaced, all good now.

Drove to work this morning, no problem. Just went out to go to lunch, and nothing when I turn the key...and I have all 8's on the LCD portions of the instrument display. Inserted key multiple times, tried in neutral, checked battery connections. Display is also flashing. Any ideas on this one? Grate...

You might try Voluparts in Atlanta, Ga. They are awesome, helpful, and have everything Volvo. They ship all over the country. www.voluparts.com

My 98 V70 was doing the exact same thing. One shop told me I had a blown head gasket...another said replace the temp sending unit. I bought a sender and thermostat. When I removed the thermostat housing, I discovered that the thermostat was broken in 2 pieces and would float and stop up the water pa...