2000StreetRod
Moderator Emeritus
- Joined
- May 26, 2009
- Messages
- 10,597
- Reaction score
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- City, State
- Greenville, SC
- Year, Model & Trim Level
- 00 Sport FI, 03 Ltd V8
2003 Explorer Centennial (Ford 100 year anniversary Limited) with 4.6L V8.
Began dying at closed throttle so I replaced spark plugs and then IAC valve. At half full fuel tank added bottle of Techron fuel injector cleaner. Tank now at quarter full. Engine no longer dies but still rough idle. Current DTCs:
P0152 - O2 Sensor Circuit High Voltage, Bank 2 Sensor 1 (too rich)
P2197 - O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 1)
P2198 - O2 Sensor Signal Biased/Stuck Rich (Bank 2 Sensor 1)
No misfire codes detected.
I added the fuel injector cleaner thinking that an injector on bank 2 (driver side) might be sticking (sometimes open and sometimes closed) resulting in the conflicting too lean and too rich DTCs for the same O2 sensor. However, burning a quarter tank of fuel should have been enough for the Techron to do its job and no misfires makes me suspect there is something else amiss. I guess the next step is to check the wiring to the O2 sensor and the sensor electrical connector. I know the heater wires are still connected since there is no associated code reported. I'll also clean the exterior of the O2 sensor since the atmospheric vent could be clogged but it looks pretty clean.
The sensor is probably more accessible than the connector.
Began dying at closed throttle so I replaced spark plugs and then IAC valve. At half full fuel tank added bottle of Techron fuel injector cleaner. Tank now at quarter full. Engine no longer dies but still rough idle. Current DTCs:
P0152 - O2 Sensor Circuit High Voltage, Bank 2 Sensor 1 (too rich)
P2197 - O2 Sensor Signal Biased/Stuck Lean (Bank 2 Sensor 1)
P2198 - O2 Sensor Signal Biased/Stuck Rich (Bank 2 Sensor 1)
No misfire codes detected.
I added the fuel injector cleaner thinking that an injector on bank 2 (driver side) might be sticking (sometimes open and sometimes closed) resulting in the conflicting too lean and too rich DTCs for the same O2 sensor. However, burning a quarter tank of fuel should have been enough for the Techron to do its job and no misfires makes me suspect there is something else amiss. I guess the next step is to check the wiring to the O2 sensor and the sensor electrical connector. I know the heater wires are still connected since there is no associated code reported. I'll also clean the exterior of the O2 sensor since the atmospheric vent could be clogged but it looks pretty clean.
The sensor is probably more accessible than the connector.