The heated O2 sensor located on the exhaust header pipe directly after the exhaust manifold on the passenger side of the engine is probably bad, replace it.
The Exhaust Manifold Oxygen Sensor needs to be replaced.
P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
Trouble code P0340 means:Camshaft position sensor circuit malfunction
Trouble code P0100 means:Mass or volume air flow circuit malfunction
Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
What are the steps to change the heater core on a 1991Chevy S10 pickup ?
If you have not changed the Oxygen sensors I would do that. The O2 sensors ( which are a maintance item) need to be replaced when you have incorrect fuel delivery problems. Mark I had the same codes on my 96 Silverado and it was my fuel pump. Usually your 02 sensors will have a {no activity},{no response} or {heater circuit malfunction} when they are bad.
Where is heater core located on 92 chev
The 1996 GMC half ton pickup truck heater core can be removed by removing the heater core retaining bolts. Remove the heater core water lines. Reverse the process to install the new heater core.
Bad resistor or a malfunction in the switch.
Heater core? Inlet or outlet hose fitting at heater core?
How do I repair heater that won't shut off in 1998 chevy s-10 zr2 pickup?