Code
P1157
LAND ROVER
P — Powertrain
Missing key H02S-22, sensor indicates tilt
Views:
UK: 13
EN: 25
RU: 23
AI status
Completed
Completed
100%
Causes
- Failed oxygen sensor (H02S-22)
- Damaged or disconnected sensor connector or wiring harness
- Heater circuit open, shorted or blown fuse/relay
- Corroded pins or poor ground
- Sensor installed incorrectly or physically tilted/damaged
- Contaminated sensor (oil, coolant, silicone)
Symptoms
- Check Engine MIL illuminated
- Persistent or intermittent O2 sensor fault codes
- Poor fuel economy or fuel trim abnormalities
- Rough idle or hesitation under load
- Failed emissions test
- Possible reduced heater operation (long warm-up times)
What to check
- Read freeze-frame and all related codes with a capable scan tool (check live O2/trim data).
- Visually inspect the H02S-22 sensor, mounting and wiring for damage, contamination or incorrect orientation.
- Inspect connector pins for corrosion, bending, or pushed-out terminals.
- Check fuses/relays related to O2 sensor heater circuit.
- Measure heater element resistance at the sensor (compare to spec).
- Back-probe sensor connector to check heater supply voltage and ground with key ON and engine off, and while running if required.
Signal parameters
- Narrowband upstream O2 voltage (typical): 0.1–0.9 V switching; rapid switching at stoichiometry.
- Downstream/diagnostic O2 voltage: generally steadier ~0.4 V (depends on sensor type).
- Heater element resistance (typical range): a few ohms to a few tens of ohms — consult Land Rover spec for H02S-22.
- Heater supply voltage: ~12 V (battery) present when heater commanded or during key ON as per manufacturer strategy.
- Response time: healthy upstream sensor should switch quickly (
- Open/short conditions: very high resistance/infinite = open heater; near 0 Ω = shorted.
Diagnostic algorithm
- Retrieve all stored codes and freeze-frame data. Note related O2/trim codes and conditions.
- Visually inspect the H02S-22 sensor, its mounting orientation and surrounding exhaust for physical damage or contamination. Correct any obvious issues.
- With key OFF, unplug the sensor connector and inspect pins/terminals. Repair or replace corroded or damaged connectors.
- Measure heater resistance at the sensor leads and compare to factory specification. If out of range, replace the sensor.
- With key ON (engine off), check for heater supply voltage and a good ground at the harness connector. If no supply, inspect fuses/relays and wiring back to the source.
- Start engine and monitor O2 sensor voltage and heater control status with a scan tool. Observe response and look for stuck/flat signals or abnormal voltages.
- Perform a wiggle/strain test on harness while monitoring live data to detect intermittent faults. Repair wiring as needed.
- If wiring and connectors are good but signal remains abnormal, swap with a known-good sensor or install a new H02S-22 sensor and retest.
- If a new sensor does not clear the fault, consider ECU input fault or required software update; consult Land Rover technical service information before replacing ECU.
- After repairs, clear codes and perform a drive cycle or readiness test to confirm the issue is resolved.
Likely causes
- Broken wire or pin at the H02S-22 connector
- Open or high-resistance heater element in the sensor
- Corroded connector terminals causing intermittent contact
- Sensor physically dislodged or tilted out of specified orientation
- Failed oxygen sensor due to age or contamination
Fault status
Status
Heated oxygen sensor H02S-22 missing/tilted or circuit output out of expected range — check sensor, heater circuit and wiring.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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