DTC P2251, P2254: A/F Sensor (RH) Negative Current Control Circuit/Open, A/F Sensor (LH) Negative Current Control Circuit/Open: Notes

DTC P2251, P2254 CHART (MZI-3.7)

DTC P2251	P2251: A/F sensor (RH) negative current control circuit/open
DTC P2254	P2254: A/F sensor (LH) negative current control circuit/open
DETECTION CONDITION	P2251 indicates that A/F sensor (RH) negative current control circuit/open P2254 indicates that A/F sensor (RH) negative current control circuit/open The powertrain control module (PCM) monitors the universal heated oxygen sensor (HO2S) for a circuit concern. This DTC sets when the PCM detects a concern with the circuit used to determine the oxygen content in the exhaust gas.
POSSIBLE CAUSE	Open A/F sensor circuit P2251: Open circuit in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BD A/F sensor (RH) terminal F-PCM terminal 2AG A/F sensor (RH) terminal H-PCM terminal 2AC Short to ground in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BD A/F sensor (RH) terminal F-PCM terminal 2AG A/F sensor (RH) terminal G-PCM terminal 2AS A/F sensor (RH) terminal H-PCM terminal 2AC Short to power supply in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BD A/F sensor (RH) terminal F-PCM terminal 2AG A/F sensor (RH) terminal G-PCM terminal 2AS A/F sensor (RH) terminal H-PCM terminal 2AC P2254: Open circuit in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BF A/F sensor (RH) terminal F-PCM terminal 2AK A/F sensor (RH) terminal H-PCM terminal 2AE Short to ground in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BF A/F sensor (RH) terminal F-PCM terminal 2AK A/F sensor (RH) terminal G-PCM terminal 2AO A/F sensor (RH) terminal H-PCM terminal 2AE Short to power supply in wiring harness between the following terminals: A/F sensor (RH) terminal D-PCM terminal 2BF A/F sensor (RH) terminal F-PCM terminal 2AK A/F sensor (RH) terminal G-PCM terminal 2AO A/F sensor (RH) terminal H-PCM terminal 2AE Damaged A/F sensor PCM malfunction
Courtesy of MAZDA MOTORS CORP.