Hi Tech,

The famous Check Engine light came on yesterday on my '02 V-70 T5 with 65K miles. Hooked up the ODBII and got this code P0030 - Bank 1, circuit 1, Heater Circuit. After reading this and other Volvo forums I assume I have a bad Oxygen sensor. How do I proceed to determine which one it is and can I do it myself?

thanks,

steve