The Nissan Path

[Johnnyfalcon2]

Then i drained some oil then it still drove with low power. Then a check engine light came on , at autozone it said bad crankshaft sensor on the code.... Well the next day i try to drive , i didnt get the check engine light but the engine was running with low power. Can i fix this issue with a cleaner or a flush?

[smj999smj]

The crankshaft position sensor, which is located on the top/left of the transmission bellhousing, will not affect drivability on VG-series engines; it is for ECM monitoring, only. As to why you have low power, is hard to say. You don't mention how much you overfilled it. If it was a quart or less, the overfill may not have anything to do with the current lack of power, even if the timing of the issue in regards to the overfill would suggest otherwise. Often I see crank position sensor codes trigger on these engine when the distributor is starting to fail. Sometimes you just need to check your basics: fuel pressure within specs, condition of secondary ignition parts, exhaust restriction, etc.
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2006 Pathfinder LE VQ40DE AWD, aftermarket radiator, Airlift 1000's, Bilstein HD rear shocks, Doug Thorley shortie headers and mid-pipes, Magnaflow 12580 muffler, aFe Momentum GT CAI w/ dry filter, XTP plenum spacer, Superchips Flashpaq tuner

[Johnnyfalcon2]