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Old 10-13-2019, 01:51 AM
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smj999smj smj999smj is offline
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2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
 
Join Date: Jun 2012
Location: Prospect, VA
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There is only one knock sensor and it is located on the top (in the "V") of the engine block, or, under the lower intake manifold. It will not cause an engine performance or drivability issue. If there is something that is causing and engine "knock," be it pre-ignition detonation, engine misfire or even a mechanical knock, i.e. a spun rod bearing, it will trigger the code and store it and the ECM will receive the signal from it and retard the ignition timing a few degrees in response, to help minimize damage to the engine. It, in itself, will usually not cause the CEL to turn on unless its circuit is shorted or open. For that reason, it is usually found with other codes. In those cases were there are more than one code, you should ignore the knock sensor code and address the other code(s). When the CEL is flashing, it indicates that there is a current problem that can cause damage to the catalytic converter. Most of the time it is a misfire of some sort and apparently, based on what you've told us, there is still an issue with cylinder #3. Sometime the wires break right at or in the harness connector for the coil pack. You may have a wire to that coil shorted or open somewhere. A bad fuel injector or injector circuit for cylinder #3 can also cause this. If it doesn't appear to be one of those, I would do a compression and cylinder leakdown test on #3 cylinder.
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