P00D3

Code

LAND ROVER P — Powertrain

Heated oxygen sensor - Heater control circuit range/ performance - Bank 2 sensor 1

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 7 EN: 21 RU: 17

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Page language: EN

Causes

Failed upstream O2 sensor heater (Bank 2 Sensor 1)
Open or short in heater wiring (broken wire, chafing, or short to battery/ground)
Corroded, loose, or contaminated sensor connector or pin(s)
Blown fuse or faulty relay supplying heater circuit (if applicable)
High resistance in circuit due to corrosion or damaged terminal
Faulty ECM heater driver (less common)

Symptoms

Check Engine Light (MIL) illuminated
Extended catalyst/engine warm-up time and higher cold emissions
Possible failed emissions test
Poor fuel economy or slightly rough idle during cold start
Stored or pending freeze-frame data related to sensor/heater

What to check

Read & record freeze-frame and all related DTCs with a capable scan tool
Visual inspection of Bank 2 Sensor 1 connector and wiring for damage, corrosion, or pin push-out
Verify relevant fuses and relays for the heater circuit (if applicable)
Measure heater element resistance at the sensor (with connector disconnected)
Backprobe ECM/control connector to check for supply voltage and driver switching using a scope or DVOM (with safety precautions)
Perform an active test/commanded heater on (via scan tool) and measure current/voltage response

Signal parameters

Typical heater supply voltage: ~11–14 V (battery voltage) present at circuit feed when key ON
Heater element resistance (typical narrowband upstream): ~2–14 ohms (verify Land Rover spec for exact value)
Heater current draw: roughly 0.5–2 A (depends on sensor design)
ECM driver output: pulsed on/off or switched ground; observe duty cycle during commanded operation
Expected voltage at ECM control pin: near battery voltage when driver off, pulsed toward ground when driver active (or vice versa depending on design)

Diagnostic algorithm

Retrieve all DTCs and freeze-frame data. Note any related codes (other O2 sensor heater or sensor codes) and pending events.
Perform a thorough visual inspection of Bank 2 Sensor 1 harness and connector (from sensor to ECM). Look for melted insulation, rodent damage, corrosion, or water intrusion.
With ignition OFF, disconnect the sensor connector and measure heater resistance across the heater pins. Compare to Land Rover specification. If open or out of spec, replace sensor.
Check for short to voltage or ground: with connector disconnected, measure resistance from each heater pin to battery positive and to chassis ground. Infinite/very high resistance expected to opposite circuits.
With key ON (engine off), verify there is battery voltage on the heater supply wire (if circuit has fused feed). If no voltage, check fuse/relay and wiring to battery/power source.
Command the heater ON using a scan tool (if available) and measure current draw and voltage at the sensor connector. Verify the ECM is commanding and the heater responds (current flows).
Backprobe ECM control pin while commanding heater: confirm driver is switching as expected. If ECM is commanding but heater not drawing current, suspect open/high-resistance wiring or failed heater element.
If wiring and sensor check good but no proper driver signal, verify ground and supply circuits to ECM and consult manufacturer procedures before replacing ECM.
After repair or replacement, clear codes, perform readiness checks and a test drive to confirm code does not return and sensor heats/operates normally.

Likely causes

Damaged or corroded sensor connector
Open or high-resistance wiring to heater element
Failed heater element inside sensor
Blown fuse or interrupted power feed to heater
ECM driver fault (only after wiring and sensor checked)

Fault status

⚠️ Status

Heated oxygen sensor heater control circuit range/performance fault detected for Bank 2 Sensor 1. The heater circuit response is outside expected parameters (open, short, high resistance, or driver failure).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

Repair manuals

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P00D3 — Heated oxygen sensor - Heater control circuit range/ performance - Bank 2 sensor 1