I have a 2013 Suburban 1500 LTZ 4x4 with the aluminum block LC9 5.3. The other day I had the CEL illuminate for a code called P015B, which means that the powertrain control module detected a delayed response time from the upstream oxygen sensor or circuit for engine bank one.
I read online that the most common cause is a bad sensor. Thing is my Burb is equipped with 2 upstream sensors, one on each exhaust pipe. So I replaced the one on the passenger side and cleared the code. Almost 3 weeks later the CEL comes back on again, same code. What else could be causing this? I am new to the forum so any help would be much appreciated.
I read online that the most common cause is a bad sensor. Thing is my Burb is equipped with 2 upstream sensors, one on each exhaust pipe. So I replaced the one on the passenger side and cleared the code. Almost 3 weeks later the CEL comes back on again, same code. What else could be causing this? I am new to the forum so any help would be much appreciated.
