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I had all sensors replaced in my 03 Trailblazer and the check engine light stiil comes on. Why?
NO. there 2 different things / sensors.
Yes. Cam sensor will determine the rotation of the camshaft, and if it does not sense it 'turning' the sensor will not allow the engine to start (it protects damaging the engine). Faulty camshaft or crankshaft sensors will stall engine and prevent restart until replaced.
A defective O2 sensor will not prevent the engine from starting. The engine will start and run albeit not as it should.
Generally there are two O2 sensors, 1 before the cat and 1 after. However, I have a 95 Cirrus LX and both are before the cat. If your looking from underneath the car where both sensors are before the cat, the first sensor you see from underneath as you follow the exhaust pipe will be sensor #2. If your check engine light is on, using a scan tool, it will give you the code for which sensor is faulty. Bank 1 Sensor 1 equals the first sensor closest to the engine, Bank 1 Sensor 2 equals the second sensor furthest from the engine or closest to the cat.
looking at the engine from the passengers side of the engine bay, it is the black sensor on the right side of the throttle body. it is on the opposite side if the throttle cable
There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.
You need to find a suitable place to put another sensor. See the link. It is also important to connect the wiring properly.
There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.
There are sensors all over the engine that can turn the check engine light on.There are sensors all over the engine that can turn the check engine light on.
There are to many sensors to list. What sensor are you looking for, And what is the engine size. NEUTZ.
Common results point to "You can not clean an O2 sensor, it must be replaced"