P2240

Code

LAND ROVER P — Powertrain

Positive current control of the oxygen sensor - circuit open. Bank 2 - sensor 1

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 17 EN: 34 RU: 37

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Page language: EN

Causes

Open or broken heater power lead to O2 sensor (Bank 2 Sensor 1)
Blown fuse or failed relay supplying O2 heater circuit
Corroded/loose or damaged sensor connector
High resistance or broken internal heater element in the sensor
Poor ground or body/chassis connection affecting heater return
PCM or heater driver output fault

Symptoms

MIL (Check Engine Light) illuminated
Extended warm‑up time to closed‑loop fuel control
Reduced fuel economy and increased emissions
Possible rough idle or drivability issues until sensor heats
Failed emissions test

What to check

Read freeze frame and live data with a scan tool; confirm P2240 and related codes
Visually inspect Bank 2 Sensor 1 connector and wiring for corrosion, damage or disconnects
Check relevant fuses and relays for the heater circuit
Backprobe heater power and ground wires with key ON (engine OFF)
Measure heater element resistance at the sensor connector with connector disconnected
Perform continuity check from sensor power pin to fuse/relay and from sensor ground to chassis/PCM ground

Signal parameters

Typical heater supply: approx. battery voltage when commanded (≈12 V) to the positive side
Heater current when active: typically a few hundred milliamps to a few amps (vehicle/substrate dependent)
Heater resistance: commonly in the low ohm range (approx. 2–20 Ω depending on sensor type) — compare to OEM spec
PCM driver: switched/controlled positive side (PWM or on/off) — verify waveform when commanded

Diagnostic algorithm

Verify code P2240 and capture freeze frame; note related codes (other O2 heater or sensor codes).
Visually inspect harness and connector for Bank 2 Sensor 1; repair any obvious damage or corrosion.
Check fuses/relays supplying O2 heater circuit; replace if blown or faulty.
With connector disconnected, measure heater element resistance at the sensor and compare to OEM specification. Very high or infinite resistance indicates a failed heater.
Backprobe the sensor power terminal with key ON (engine OFF). Confirm battery voltage is present or that the PCM can supply voltage when commanding heater ON via a scan tool.
Command heater ON with scan tool; observe voltage/current and any change in resistance/waveform. Wiggle wiring to check for intermittent opens.
Check continuity from the sensor power pin back to the fuse/relay and inspect grounds/PCM connector for continuity or shorts to ground.
If wiring, connectors and fuses are good but heater is open, replace the O2 sensor (Bank 2 Sensor 1).
If new sensor still reports the same code and wiring is verified, consider PCM/driver fault and consult manufacturer resources for PCM testing or replacement.

Likely causes

Open or damaged wiring at sensor connector
Blown fuse or failed heater relay
Failed heater element inside the O2 sensor
Corroded/contaminated connector causing open connection

Fault status

⚠️ Status

Positive current control (heater) circuit open for oxygen sensor Bank 2 Sensor 1. Check heater power, connector, fuse/relay, wiring and sensor heater element.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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P2240 — Positive current control of the oxygen sensor - circuit open. Bank 2 - sensor 1