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What sensor is bank 1 sensor 1 upstream or downstream?

Bank 1 Sensor 1 means Upstream Right/Rear;Bank 2 Sensor 1 means Upstream Left/Front;Bank 1 Sensor 2 means Downstream Right/Rear;Bank 2 Sensor 2 means Downstream Left/Front.


How many O2 sensors does a 2004 Acura TL have?

For the TL, there are four different O2 sensors: two located before the cats (upstream) and two after (downstream). Specifically, the one to the rear of the engine and before the cat is considered bank 1, sensor 1 or B1S1.


What side is bank 1 sensor on?

Bank 1 Sensor 1 is the first sensor closest to the engine. On Bank 1 means it is at the engine side with cylinders 1, 3, 5, 7, etc. Bank 1 Sensor 2 is the second sensor on the engine’s exhaust pipe, usually behind the catalytic converter. On Bank 1 means it is at the engine side with cylinders 1, 3, 5, 7, etc.


Is bank 1 passenger or driver side?

Typically, bank 1 is the driver side, but this isn’t true in all cases. For example, BMW E38 7 series has bank 1 on the passenger side.


What is a bank 1 catalytic converter?

The P0420 Code indicates that your car’s computer has detected underperformance from the Bank 1 catalytic converter. Bank 1 refers to the side of the engine that houses the number one cylinder. The opposite side of the engine is Bank 2.


Is bank one oxygen sensor upstream or downstream?

Bank 1 is the side of the engine where cylinder #1 is located. Bank 2 is opposite to Bank 1. Sensor 1 is the upstream sensor. Sensor 2 is the downstream sensor.

Also read:  Does the 1998 Acura Integra have VTEC?


How do I know if my O2 sensor is upstream or downstream?


Which O2 sensor is downstream?

Sensor 2 is the downstream oxygen sensor. It is always going to be located after the catalytic converter. Its job is to monitor the oxygen content exiting the catalytic converter in order to determine if it is operating efficiently. In some cases, there will be a Sensor 3.


Is the air-fuel ratio sensor an upstream or downstream?

The front oxygen sensor or air fuel ratio sensor is installed before the catalytic converter; it’s called an ‘upstream’ or ‘Sensor 1’. The rear oxygen sensor installed after the catalytic converter is called ‘downstream’ or Sensor 2.


How do I change the o2 sensor on my Acura TL?