Getting the following codes regarding O2 sensors and would like to know what the recommended replacement part numbers for each is. Atlantic British has a pretty wide variety of O2 sensors to choose from. Have a 2002 RR HSE with about 116K miles. Not that this has any bearing on the codes, but I recently had all plugs, MAF sensor, and water pump replaced by a certified mechanic.
P0133 (O2 Sensor CKT Slow Response (Bank 1, Sensor 1)
P0155 (O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1)
P0420 (Catalyst Efficiency Below Threshold (Bank 1)
Pulled the codes with an Actron CP9175 OBDII Reader. Also, I don't consider myself a mechanic, but I do have the workshop manual and I'm pretty technically inclined. Is this something that can be done by myself or is it recommended that I take it to a mechanic.
P0133 (O2 Sensor CKT Slow Response (Bank 1, Sensor 1)
P0155 (O2 Sensor Heater Circuit Malfunction (Bank 2, Sensor 1)
P0420 (Catalyst Efficiency Below Threshold (Bank 1)
Pulled the codes with an Actron CP9175 OBDII Reader. Also, I don't consider myself a mechanic, but I do have the workshop manual and I'm pretty technically inclined. Is this something that can be done by myself or is it recommended that I take it to a mechanic.