P0158

Code

LAND ROVER P — Powertrain

high voltage of the circuit of sensor P215 (bank 2 sensor 2)

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 33 EN: 38 RU: 35

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Page language: EN

Causes

Short to battery/12V on the sensor signal wire
Faulty oxygen sensor (Bank 2 Sensor 2)
Contaminated or failing sensor (coating, oil, coolant)
Wiring damage, connector corrosion, or poor ground
Exhaust leaks near the sensor or incorrect sensor installed
Fuel system running rich (fuel pressure regulator, leaking injector)

Symptoms

Check Engine Light (MIL) illuminated
Possible slight drivability issues (reduced fuel economy, mild roughness)
Failed emissions test (high HC/CO)
Stored freeze frame/live data showing high Bank 2 Sensor 2 voltage

What to check

Read freeze frame and live data: monitor Bank 2 Sensor 2 voltage and compare to Bank 1 Sensor 2 and upstream sensors
Inspect wiring harness and connector for damage, corrosion, melted insulation or rodent damage
Backprobe the sensor signal wire with multimeter/oscilloscope to confirm voltage behavior
Check for exhaust leaks or recent exhaust work near the sensor
Scan for related codes (fuel trim, misfire, other O2 sensor codes)
Verify fuel pressure and injector operation if a rich condition is suspected

Signal parameters

Normal narrowband O2 sensor voltage range: ~0.1–0.9 V
Downstream (sensor 2) typically shows a steadier voltage near ~0.4–0.6 V when catalyst is good; long readings >0.9 V indicate high/rich or short to 12V
ECM fault criteria commonly: sensor signal above threshold (≈0.9 V) for a set time or repeated count
Heater circuit (if applicable) should see battery voltage on supply and low resistance to ground (check factory spec)

Diagnostic algorithm

Retrieve freeze frame and live data. Confirm P0158 is active or historic and note conditions (RPM, load, temp).
Compare Bank 2 Sensor 2 voltage to Bank 2 Sensor 1 and Bank 1 Sensor 2. A significantly higher/stuck voltage suggests wiring or sensor issue.
Visually inspect harness and connector at the sensor and along the harness to the ECM for damage, corrosion or pinched wires.
With key on engine off, backprobe the sensor signal wire and measure voltage. If ~12V or stuck high, disconnect connector — if voltage falls to expected range or 0 V, suspect short in harness or mating connector.
Check for short to battery: isolate the signal wire and measure resistance to battery + with ignition off. Low resistance indicates short to 12V.
Check sensor ground/reference continuity to ECU ground. Poor ground can cause erroneous high readings.
If wiring checks OK, test the sensor itself: measure sensor output while engine running (use DSO/graphing scan tool if available) and compare behavior to a known good sensor or bank 1 sensor 2.
Inspect for conditions that cause a legitimately rich reading: fuel pressure test, injector leak test, check for stuck open fuel pressure regulator or failed fuel pressure sensor.
If wiring and fuel system OK, replace the Bank 2 Sensor 2 with a known good/new sensor and clear codes. Re-test on road and re-check live data.
If problem persists after sensor replacement, inspect ECM grounds and perform ECU-related diagnostics — consult manufacturer service information for ECU tests.

Likely causes

Damaged harness or connector causing signal to be pulled high
Failed downstream O2 sensor (internal short or contamination)
Shorted sensor signal to a fused 12V source (heater or other)
Persistent rich condition causing legitimate high sensor voltage

Fault status

⚠️ Status

P0158 — Oxygen sensor circuit high voltage (Bank 2, Sensor 2). Sensor signal above normal limits or shorted high; stored by ECM when threshold/time criteria met.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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P0158 — high voltage of the circuit of sensor P215 (bank 2 sensor 2)