How many O2 sensors does a 06 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. via

Do you need both O2 sensors?

Manufacturers recommend replacing O2 sensors in pairs (both Upstream or both Downstream). An older, slower sensor can cause an imbalance in the engine management system, leading to poor fuel economy and possible damage to the catalytic converter. via

What is code P2195 mean?

The P2195 code is a result of the engine control module (ECM) indicating that the oxygen sensor is fluctuating outside its optimal range. This specified range is characterized by a minimum of 10 cycles per second. via

What are diagnostic trouble codes?

A DTC, short for Diagnostic Trouble Code, is a code used to diagnose malfunctions in a vehicle or heavy equipment. While the malfunction indicator lamp (MIL)—also known as the check engine light—simply alerts drivers that there is an issue, a DTC identifies what and where the issue is. via

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