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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System (2GR-FKS) - Diagnostic Codes (6 Of 6) & Circuit Tests (1 Of 2) >> SFI System >> DTC P2237-11: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Ground; DTC P2237-12: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Short to Battery; DTC P2237-13: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Open; DTC P2237-16: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Below Threshold; DTC P2237-17: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Voltage Above Threshold; DTC P2237-1B: A/F (O2) Sensor Positive Current Control Bank 1 Sensor 1 Circuit Resistance Above Threshold; DTC P2240-11: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Short to Ground; DTC P2240-12: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Short to Battery; DTC P2240-13: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Open; DTC P2240-16: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Voltage Below Threshold; DTC P2240-17: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Voltage Above Threshold; DTC P2240-1B: A/F (O2) Sensor Positive Current Control Bank 2 Sensor 1 Circuit Resistance Above Threshold; DTC P2251-11: O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Ground; DTC P2251-12: O2 Sensor Negative Current Control Bank 1 Sensor 1 Circuit Short to Battery; DTC P2254-11: O2 Sensor Negative Current Control Bank 2 Sensor 1 Circuit Short to Ground; DTC P2254-12: O2 Sensor Negative Current Control Bank 2 Sensor 1 Circuit Short to Battery [12/2019 - 10/2022] >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

P2237 AND P2240: OPEN CIRCUIT BETWEEN A1A+ AND A1A- / A2A+ AND A2A-

Air fuel ratio sensor admittance Less than 0.0018 1/Ω
P2238 AND P2241: LOW ADMITTANCE

Air fuel ratio sensor admittance Less than 0.0054 1/Ω
P2238 AND P2241: SHORT CIRCUIT BETWEEN A1A+ AND GND / A2A+ AND GND

A1A+ / A2A+ terminal voltage 0.5 V or less
P2238 AND P2241: SHORT CIRCUIT BETWEEN A1A+ AND A1A- / A2A+ AND A2A-

Difference between A1A+ and A1A- / A2A+ and A2A- terminal voltage 0.1 V or less
P2239 AND P2242: SHORT CIRCUIT BETWEEN A1A+ AND +B / A2A+ AND +B

A1A+ / A2A+ terminal voltage Higher than 4.5 V
P2239 AND P2242: SHORT CIRCUIT BETWEEN A1A+ AND A1A- / A2A+ AND A2A-

Difference between A1A+ and A1A- / A2A+ and A2A- terminal voltage Higher than 0.8 V
P2252 AND P2255: SHORT CIRCUIT BETWEEN A1A- AND GND / A2A- AND GND

A1A- / A2A- terminal voltage 0.5 V or less
P2253 AND P2256: SHORT CIRCUIT BETWEEN A1A- AND +B / A2A- AND +B

A1A- / A2A- terminal voltage Higher than 4.5 V
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