1. That the specific O2 Sensor the DTC is accusing as having a heater malfunction does not have its wires shorted and melted together on the exhaust pipe. When this happens, you can bet that the O2 Sensor Heater fuse has blown.
This is usually the end result of human error, usually because some component was removed and replaced and the O2 Sensor had to be disconnected.
When reconnected, the wiring was not secured to its original routing and the wires ended up rubbing against the exhaust pipe or exhaust manifold.
2. That 12 Volts are present in at least one of the 4 wires. You need to test for these 12 Volts with a Multimeter in Volts DC mode with the Key On (but Engine Off). I suggest testing for this voltage even if the O2 Sensor's wires are NOT shorted and melted to the exhaust pipe or exhaust manifold.
Well, to make the long story short, you'll usually see one of the following cases:
CASE 1: O2 Sensor wires are not melted together and 12 volts are present. Then you can replace the O2 Sensor with confidence knowing the Diagnostic Trouble Code will be solved.
CASE 2: O2 Sensor wires are melted together and 12 volts are NOT present, then the O2 Sensor heater fuse is blown (and of course you'll have to replace the O2 Sensor too).
Bank 2 sensor 1 means that the O2 sensor inquestion is the one before the catalytic converter on the passenger side of the engine.
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Saturday, December 15th, 2012 AT 10:06 PM