Originally Posted by cheyoru

Hi All!

I have a Check Engine Light giving me codes P0154 and P0155:

P0154 O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)

After reading some threads, I cleared the codes in hopes of them not coming back. However, after driving it for a couple of days they came back. In your experience, does that automatically mean that I need to replace Sensor 1 in Bank 2? Is there another trick I should try? I am going to fill the tank with gas Techron 93 next time as it currently has Shell 93, which may have contained ethanol.

Also, is there a place you'd recommend I buy this sensor from? Thanks for any help!

Best,

1. Sergio