On my truck i have a sensor located on the head between the cylinder number 1 and number 3 spark plugs that is broken where the wires hook into it and i need to know what kind of sensor it is.The book i bought ( a haynes repair manual) does not have a sensor even located there. I need to know if it is a knock sensor for my esc system or something else.
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If your talking the 02 sensor, it's in the exhaust. Bank one is the bank with the number 1 cylinder and sensor 1 is the first 02 sensor.
The number 1 cylinder shows to be located in the rear bank. If you only have two 02 sensors, that would be one before the cat and one after.
On V engines one of the cylinder heads is located further forward than the other. That is the side that has cylinder #1 on it. That is bank 1. The other side is bank 2. There are 2 oxygen sensors-one in front of the cat convertor and one behind it. Sensor 2 is behind the convertor. It looks kind of like a spark plug with wires coming out the top
Locate the number 1 spark plug and then locate the O2 sensor in the exhaust. The one you see nearest the cylinder head is number 1. Look underneath the vehicle and locate the catalytic converter and the number 2 sensor is just before the "cat" and the one after is the Bank 2 sensor 2. I believe that the number one cylinder is closest to the radiator and the front of the engine. If this is a 4 cylinder car it is the sensor in the exhaust just prior to the catalytic converter. You will need a 7/8" or 22mm wrench and a good rust penetrant to remove the sensor without incident. Let me know if you need anything else.
Bank 1 is where the number one cylinder/spark plug is located. If this is a 4 cylinder engine, number 1 is at the front of the motor and bank 1 is irrelevant and the number 1 sensor would be the one screwed into the exhaust manifold attatched to the cylinder head. If it is a 6 cylinder than number one is on the side closest to the radiator, and at the back of the engine near the exhaust crossover. The number 1 sensor is going to be the one screwed into the exhaust manifold just outside the cylinder head.
4.3 v/6 firing order for an S-10 Chevy is 1-6-5-4-3-2, a helpful tip to always locate # 1 spark plug on a v engine.
If you look carefully at the cylinder heads note the very front of each, do you see one sticks out slightly further to the front then the other?
Tghis is the way these engines have to be cast for proper cylinder and timing rotation.
The furthest forward cylinder head is in fact the home of #1 cylinder, it is the first spark plug on that head, which in this case is the right side head.