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Is the check engine light on ? The computer should be able to adjust ignition timing to stop the pinging if it really is spark knock. Its possible you have an ignition timing problem, or low fuel pressure.
First of all, stop driving it. Second of all, it may be that your oil pump may be going out, however unless you are a mechanic, I wouldn't go any further.
take car to local part store they diagnose for free ....it might just need a tune the diagnose can tell you exactly what is causing the check engine light to come on
best advice here is to ask a local mechanic to have a look as engine shouldnt have started knocking with teh new oil in unless someone has put tranny fluid into teh engine or something stupid ,the lights for the airbag shouldnt be connected but the oil light ?? Do not drive car untill a mechanic has come around and checked it out for you though as this oil light coming on and knocking noise is serious
i honestly have never seen a knock sensor go bad. a knock sensor detects spark knock,which is from low octane gas. if it hears this then the ecm retards the timing to stop the knock. you wont be able to hear the knock that its listening for. its like a little microphone stuck in the block. before you replace it you might want to check the plugs on the sensor itself. if they are corroded they could cause this problem.. ANYTIME you have engine codes ,always check your ground cables on the engine and the battery. i work in the marine industry and you would be amazed all the codes you can get just from having a corroded battery cable..like i said , i have never seen a knock sensor go bad..
Does it happen only when youre driving? Because I had the same car and mine had a rattle/knocking noise and it was the "Harmonic Balancer" (Crankshaft pulley) and those cars are known for it! It knocked really loud but if you pushed the throttle it would stop.
Sometimes collapsed lifters or loose rocker arms can cause knocking sounds in an engine. However, the fact that there was a possible loss of oil pressure and that the knocking gets louder as the rpm's increase, would indicate that there is damage to a connecting rod bearing and possibly the crankshaft. If the latter is the case you are looking at a fairly substantial repair bill.
buy a can of sea foam, it comes in a white metal can pour it in your fuel tank and the service engine light will go out within 100 miles, i have the same truck worked great for mine same problem you had. best of luck.
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