Contour Enthusiasts Group Archives Forums General Troubleshooting O2 heater circuit problem

I keep blowing the number thirteen fuse for the Hego sensors and it's causing a CEL. Is there some kind of common problem or am I going to have to go through the wires????

Can't say I've heard of any common problem. Could be wiring problem or faulty HO2S with the former more likely IMO to be source of short resulting in fuse blowing.

What CEL code, since it may identify particular sensor heater circuit causing problem? Any recent work that might have disturbed wiring?

Logical procedure would be to disconnect all four, install new fuse, then reconnect one at a time until fuse blows identifying faulty circuit.

p0135,p0141,p0155,p0161

So much for that idea, obviously CEL is on due to fuse blowing and all four sensors being deprived of heater power.

Area under battery and engine compartment fuse box has been the source of many elect problems for members. Wouldn't hurt to pull battery and make a physical check of wiring in that area. If all looks ok then precede as per my prior post.

thanks