Acura TL 2.5 litre with straight 5 cylinder engines has only one exhaust manifold similar to 4 cylinder engines. Hence, it has only one bank. Therefore, it is fitted with two oxygen sensors only. The first one is around the exit of the exhaust manifold (follow the manifold to the start of the pipe) and the second one screws into the catalytic converter. The first sensor is called bank 1 sensor 1 and the second one is called bank 1 sensor 2. Hope this helps.
on the header
The OS sensor on a 98 Acura 3.2 TL is located in the exhaust manifold. It constantly monitors the amount of oxygen remaining in the exhaust gases.
The oxygen sensor is connected by a wiring harness. The wiring harness contains the signal wire. The signal wire goes to the system computer.
It is on the exhaust manifold. If you look down at your exhaust manifold there should be one plug sticking out of it. That's the O2 sensor.
The 1996 Acura oxygen sensor can be found on the top of the engine. The oxygen sensor will be on the left-hand side of the air cleaner.
The 1991 Acura Legend does not have an oil temperature sensor. It does have an oil pressure sensor. The oil pressure sensor will be located on the left-hand side of the engine.
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The 1997 Acura intake air temperature sensor is located on the air filter housing. The sensor will be on the right hand side of the air filter housing.
The O2 sensors are numbered from front to back. For V6 and V8 models bank one is whichever side cylinder #1 is on.
The map sensor for the 1991 Acura Legend is mounted on the firewall. It is in a box near the factory strut brace.
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The IAT sensor on a 1999 Acura Tl is located inside the air box. The sensor reads the temperature for the air that enters into the engine through the intake system.