2005 Acura TL P0157 Fault: How to Locate Bank 2 Sensor 2 O2 Sensor and Fix Rich Running Symptoms
I'm experiencing a persistent check engine light with code P0157 on my 2005 Acura TL. I've already replaced one oxygen sensor, but the issue returned. The car is now running rich—only achieving about 15 MPG—and feels sluggish in fifth gear. I need to locate the correct O2 sensor for Bank 2, Sensor 2 (front bank, after the catalytic converter), as this is commonly associated with P0157. According to OBD-II standards, a low voltage reading from HO2S (Heated Oxygen Sensor) at Bank 2, Sensor 2—below 0.29 V for at least 40 seconds—is what triggers this code. I've checked online resources like https://www.obd-codes.com/p015-7, but I'm still unsure about the exact location or whether simply replacing the sensor will resolve the issue. Can anyone confirm the correct sensor placement and advise on proper replacement procedures to avoid further problems?
P0157 (3.2L V6 VIN - Auto) refers to Front Secondary HO2S (Bank 2, Sensor 2). Bank 2 is the front engine bank, and Sensor 2 is located after the catalytic converter. For accurate diagnosis, use an OBD-II scanner to monitor sensor voltage levels. The fault occurs if the HO2S output voltage drops below 0.29 V for at least 40 seconds.