O2 Sensor Fault Messages

Dubya · 21st March 2019, 21:02

Hi guys, I wonder if anyone can help me determine which oxygen sensor I need to replace. The dreaded 'check engine' light popped up a couple of days ago, my OBD scanner flagged up codes P0141 and P0155. These are O2 Sensor Heater Circuit Bank 1 Sensor 2 and O2 Sensor Heater Circuit Bank 2 Sensor 1. I can clear the codes, but they return within one or two drives. With the engine running and monitoring the live data I can see the values for each sensor changing with engine speed (i.e. sensors not open/short circuited).

I find it unlikely that both sensors have failed at the same time, so can anyone suggest which sensor I should go for, also the locations of these sensors (which is which) and any other potential cause of these fault codes (for example a common voltage supply). Thank you in advance.

21st March 2019, 21:02	#1
Dubya Loves to post 2005 MG ZT-T+ V6 190 Join Date: Jun 2015 Location: Hereford Posts: 474 Thanks: 126 Thanked 139 Times in 103 Posts	O2 Sensor Fault Messages Hi guys, I wonder if anyone can help me determine which oxygen sensor I need to replace. The dreaded 'check engine' light popped up a couple of days ago, my OBD scanner flagged up codes P0141 and P0155. These are O2 Sensor Heater Circuit Bank 1 Sensor 2 and O2 Sensor Heater Circuit Bank 2 Sensor 1. I can clear the codes, but they return within one or two drives. With the engine running and monitoring the live data I can see the values for each sensor changing with engine speed (i.e. sensors not open/short circuited). I find it unlikely that both sensors have failed at the same time, so can anyone suggest which sensor I should go for, also the locations of these sensors (which is which) and any other potential cause of these fault codes (for example a common voltage supply). Thank you in advance. __________________ 7,925th ZT-T to run off the production line, out of 8,249 The 1,709th ZT-T 190 + to be made out of 1,756 The 103rd ZT-T in Mica Blue (Ignition) (code: JGY) to be made out of 160 Mica Blue (Ignition) ZT-Ts