SOURCE: Where is the camshaft position sensor located-99 Chevy Lumina 3.1
It's held down by one bolt right above the timing chain cover. It's next to the head that's facing toward the front of the car.
SOURCE: locate camshaft sensor 2002 chevy trailblazer
Assuming you have a 4.2L engine here is the location.
Hope this helps out,
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Brett
SOURCE: Code p0141 02 Sensor Heater Circuit Malfunct Bank #1 Sensor2
after the catalytic converter on the driver side in the exhaust pipe.
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SOURCE: 2002 Chevy Trailblazer 6 cyclinder
It sounds like your EGR valve needs to be replaced. You can go to any auto parts store and get one. Try replacing spark plugs and plug wires also. If the timing was off it would pick up speed slowly and would vibrate really bad at idle. When you go to accelerate if it doesn't accelerate normally it may be the timing but i highly dought it. Try plugs and wires first. then the EGR valve.
SOURCE: camshaft position sensor a circuit bank 1 or
for the code po340 go to this site it will help you out. obd-codes.com/po340
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