In rockauto.com there is two choices, which one OBD refer as bank 1 sensor 2
NTK Part # 23151 Upstream; 1; 2; NTK is the OE Mfg $35.79
NTK Part # 23099 Downstream; 2; NTK is the OE Mfg $35.99
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Type: Posts; User: jtravie; Keyword(s):
In rockauto.com there is two choices, which one OBD refer as bank 1 sensor 2
NTK Part # 23151 Upstream; 1; 2; NTK is the OE Mfg $35.79
NTK Part # 23099 Downstream; 2; NTK is the OE Mfg $35.99
...
I have a 1998 XJ getting OBDII codes
P0138
O2 Sensor circuit high voltage (bank 1 sensor 2)
P0141
O2 Sensor Heater Circuit (bank 1 sensor 2)
Which sensor do I need to replace upstream or...