P0138 Diagnostic Trouble Code Discussion for September 2026
Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit High Voltage
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| Help Request | Posted | |
| 1999 Jeep Grand Cherokee Laredo 4.0L Poor Idle Quality P0138: Heated Oxygen Sensor (Bank 1 Sensor 2) Circuit High Voltage. ... rich but tailpipe Not sooty, plugs were black so I replaced them. It revs up ok in neutral but driving it only goes 15 mph, fairly smoothly. Torquing it, it's rough like a misfire. I read the P0138 once,and I see s2 heater wire has probably contact... |
September 15, 2026 |
