DTC U11F1 Dodge
HO2S Signal Stuck Rich Bank 1 Sensor 2
HO2S Signal Stuck Rich Bank 1 Sensor 2
Description
Before the ECM can report DTC P2270 or P2272 failed, DTCs P0036, P0037, P0038, P0056, P0057, P0058, P013A, P013C, P013E, P0137, P0138, P014A, P0140, P0141, P0157, P0158, P0160, P0161, P0443, P0458, P0459, P2097, P2099, P2178, P2180, P2188, and P2190 must run and pass. DTC P0461, P0462, P0463, P2066, P2067, or P2068 is not set. The engine speed is greater than 240 RPM. The ignition voltage is greater than 10 volts. The HO2S 2 is at operating temperature for greater than 10 seconds. The long term fuel control is enabled. The mass air flow (MAF) signal is greater than 10 g s. The MAF signal is between 6-33 g s for greater than 3 seconds during the intrusive test. DTC P2271 and P2273 runs continuously once the conditions above are met for approximately 10 minutes, or 20 minutes if the fuel level is less than 12 percent.
Cause and Solution
The ECM detects that the HO2S 2 voltage is greater than 629 mV for greater than 100 seconds, then an intrusive test is performed. The ECM will lean the fuel mixture -2 percent per second and then wait for 10 seconds at -15 percent. If the ECM detects that the HO2S voltage is still greater than 629 mV, for 4 seconds or for a cumulative of 30 seconds the DTC sets.
Video Guide
Diagnostic Info
- DTC Code: U11F1
- Brand: Dodge