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|Overall Length:||16.9 in|
|Wire Harness Length:||13.6 in|
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Q:So what is the difference between the downstream and upstream O2 sensors on a 04 Chevy Trailblazer, and, how do I tell what is bank 1 and what is bank 2?
A:I'm happy to help, Dave! On all vehicles, including your 2004 Chevrolet Trailblazer 4.2L L6, the upstream sensors are located before the catalytic converter and the downstream sensors are located after the catalytic converter. Upstream sensors monitor the air/fuel ratio coming directly out of the engine and the downstream sensors monitor how effectively the cataytic converter(s) is/are working. With the 4.2L L6 there is only one bank.
Q:If this item is not replaced what problem will it cause.
A:Rough idle, no change in the voltage, emissions, exhaust temperatures will rise and your catalytic converter can destroy itself are the major signs of a defective Oxygen Sensor.
Q:Hello there i replace my 02 sensor and for some reason my heat in the car only 1 heat works what's up with that.
A:Sounds just like a coincidence because the O2 sensor has nothing to do with the car heater. I would look into the blower motor resistor.