There are two oxygen sensor, follow the exhaust coming out of the engine. one in the front and one in the back of the engine. if you engine code p0135 bank1 these is oxygen is located between firewall and engine. or p0755 oxygen located in front of the engine
no the primary one is the one closest to the engine
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Stop by your local AutoZone. They will hook it up to a handheld tester and print out which oxygen sensor is failing.
You need to a new oxygen sensor if you are getting a p1155 code on a 1998 Lexus. This means that heater circuit is malfunctioning.
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open the hood , its located infront of radiator feedingintothe exaust.
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