I have 1997 Chevrolet pickup 1/2 ton, V6, 4.3 L with 130,000 mile. It running rough, engine lit on, with scan code:
P0300 Random/multiple cylinder misfire detected
P0340 Camshaft position sensor circuit Malfunction
P0135 O2 Sensor heater circuit malfunction (bank 1 sensor 1)
I replaced: Spark Plug & Plug wires, cap & rotor, electronic module (near the coil), Camshaft position sensor and Crankshaft position sensor. It still have the same problem. Please help.
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You could try tapping on your catalytic converter and see if you here a rattle if you doo it could be plugged and that would through the O2 sensor off. Im not sure about the Camshaft position snesor. Try clearing your codes then reading them again to see if they were cleared.
1995 Chevy K1500 355 5 speed manual 4:56 gears 35"tires
2005 pontiac G6 V6 four door sedan
95% of the time 02 heater circuit code are bad O2 sensors.However I had a 1998 grand am Wednesday that failed OBDII emission for a O2 heater code and a evap code and the actual problem was in the under hood fuse box. The ERLS fuse ( or something like that) was not getting full power though the box which was the power source for the O2 heaters and evap system
ASE Master Tech, L1 Advance Engine Performance certified
I will not answer repair questions by PM, if you would like my input you can PM me and ask me to reply to your public thread.