axp2948

Hi guys, getting a P0135 CEL which is stating Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1). Assuming that it is just a O2 Sensor that needs replacement, can someone tell me which sensor to buy? upstream or downstream?

BOSCH 16272 OE Style Oxygen Sensor UPSTREAM

or

BOSCH 16328 OE Style Oxygen Sensor Downstream

Any help would greatly be appreciated.

Thanks,

Alex

c55asleep?

Should be upstream.

axp2948

Thank you!