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Home / DTC / P2276 — O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3

P2276 — O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3

Detailed page for trouble code P2276.

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59brands
11,845generic
22,491specific
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P2276

Generic P — Powertrain

O2 Sensor Signal Biased/Stuck Lean Bank 2 Sensor 3

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or contaminated Bank 2 Sensor 3 (post-cat O2 sensor)
  • Wiring problem: short to ground, open, corroded connector or damaged shield
  • Exhaust leak upstream of the sensor or at the sensor flange
  • Intake vacuum leak or unmetered air on bank 2
  • Fuel delivery problem (low fuel pressure, clogged injector) affecting bank 2
  • Faulty upstream O2 sensor or sensor heater affecting downstream readings

Symptoms

  • Check Engine Light (MIL) illuminated
  • Possible reduced fuel economy or failed emissions test
  • Usually little or no immediate drivability issue if only downstream sensor is affected
  • In some cases long/short term fuel trims altered or limp mode if related to other faults

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 3 and compare to Bank 1 Sensor 3 and upstream sensors
  • Inspect sensor and wiring harness for damage, corrosion, pin push-out and secure connections
  • Measure O2 sensor voltage (narrowband) or AFR/wideband output with a scan tool/oscilloscope
  • Check heater circuit continuity and resistance (compare to spec) and verify 12 V supply when key on
  • Check for exhaust leaks upstream of the sensor and at flanges/pipe joints
  • Verify fuel pressure and injector function for bank 2

Signal parameters

  • Narrowband O2 sensor (post-cat) expected: relatively steady voltage near ~0.45 V when warmed; not rapidly switching like upstream sensors
  • Biased/stuck-lean narrowband indication: voltage stuck low (< ~0.2–0.3 V) despite conditions
  • Wideband sensor: lean condition shown as AFR above stoichiometric or corresponding low/ high current/voltage per manufacturer protocol (consult vehicle-specific values)
  • Heater circuit: typical resistance a few ohms (varies by sensor); supply should be battery voltage when commanded on
  • Response: downstream sensor may show smaller amplitude changes than upstream; large persistent difference vs the opposite bank is suspect

Diagnostic algorithm

  1. Read and record freeze frame and live data for Bank 2 sensors and fuel trims. Note sensor 3 voltage/AFR and compare to Bank 1 Sensor 3 and upstream Sensor 1/2.
  2. Visually inspect Bank 2 Sensor 3 and harness for damage, heat/rub-through, corrosion or loose connectors. Repair as needed.
  3. With engine at normal operating temperature, monitor sensor voltage with a scan tool or lab scope. Confirm if the sensor is low/stuck or switching.
  4. Check heater circuit: with key on measure resistance and verify supply voltage and ground when heater is commanded.
  5. Check for exhaust leaks upstream of the sensor (use smoke, soapy water on cold joints or listen for leaks). Repair any leaks and retest.
  6. Inspect/diagnose upstream sensors on bank 2 and compare their behavior. A failed upstream sensor can bias downstream diagnostics.
  7. Check intake for vacuum leaks, test MAF/MAP and measure fuel rail pressure and injector function on bank 2.
  8. If wiring tests show intermittent or shorted circuits, perform backprobe continuity and wiggle tests; repair or replace wiring/connector.
  9. If wiring and engine systems check good, replace Bank 2 Sensor 3 with OE-correct sensor. Clear codes and test drive to confirm resolution.
  10. If code returns after new sensor, consider PCM update/diagnosis or investigate less common causes (cross-contamination, aftermarket exhaust, internal engine issues).

Likely causes

  • Damaged/contaminated Bank 2 Sensor 3
  • Wiring/connector fault (short to ground or intermittent open)
  • Exhaust leak near sensor or manifold leaking on bank 2
  • Upstream sensor or fuel/air trim issue causing sensor bias

Fault status

⚠️ Status
O2 Sensor Signal Biased/Stuck Lean — Bank 2 Sensor 3. Downstream oxygen sensor is reporting a persistent lean/low signal or out-of-range wideband reading compared to expected values.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P2276

LAND ROVER P — Powertrain

The oxygen sensor signal is lost. Bank 2 - sensor 3

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed or contaminated Bank 2 Sensor 3 (post-cat O2 sensor)
  • Wiring problem: short to ground, open, corroded connector or damaged shield
  • Exhaust leak upstream of the sensor or at the sensor flange
  • Intake vacuum leak or unmetered air on bank 2
  • Fuel delivery problem (low fuel pressure, clogged injector) affecting bank 2
  • Faulty upstream O2 sensor or sensor heater affecting downstream readings

Symptoms

  • Check Engine Light (MIL) illuminated
  • Possible reduced fuel economy or failed emissions test
  • Usually little or no immediate drivability issue if only downstream sensor is affected
  • In some cases long/short term fuel trims altered or limp mode if related to other faults

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 3 and compare to Bank 1 Sensor 3 and upstream sensors
  • Inspect sensor and wiring harness for damage, corrosion, pin push-out and secure connections
  • Measure O2 sensor voltage (narrowband) or AFR/wideband output with a scan tool/oscilloscope
  • Check heater circuit continuity and resistance (compare to spec) and verify 12 V supply when key on
  • Check for exhaust leaks upstream of the sensor and at flanges/pipe joints
  • Verify fuel pressure and injector function for bank 2

Signal parameters

  • Narrowband O2 sensor (post-cat) expected: relatively steady voltage near ~0.45 V when warmed; not rapidly switching like upstream sensors
  • Biased/stuck-lean narrowband indication: voltage stuck low (< ~0.2–0.3 V) despite conditions
  • Wideband sensor: lean condition shown as AFR above stoichiometric or corresponding low/ high current/voltage per manufacturer protocol (consult vehicle-specific values)
  • Heater circuit: typical resistance a few ohms (varies by sensor); supply should be battery voltage when commanded on
  • Response: downstream sensor may show smaller amplitude changes than upstream; large persistent difference vs the opposite bank is suspect

Diagnostic algorithm

  1. Read and record freeze frame and live data for Bank 2 sensors and fuel trims. Note sensor 3 voltage/AFR and compare to Bank 1 Sensor 3 and upstream Sensor 1/2.
  2. Visually inspect Bank 2 Sensor 3 and harness for damage, heat/rub-through, corrosion or loose connectors. Repair as needed.
  3. With engine at normal operating temperature, monitor sensor voltage with a scan tool or lab scope. Confirm if the sensor is low/stuck or switching.
  4. Check heater circuit: with key on measure resistance and verify supply voltage and ground when heater is commanded.
  5. Check for exhaust leaks upstream of the sensor (use smoke, soapy water on cold joints or listen for leaks). Repair any leaks and retest.
  6. Inspect/diagnose upstream sensors on bank 2 and compare their behavior. A failed upstream sensor can bias downstream diagnostics.
  7. Check intake for vacuum leaks, test MAF/MAP and measure fuel rail pressure and injector function on bank 2.
  8. If wiring tests show intermittent or shorted circuits, perform backprobe continuity and wiggle tests; repair or replace wiring/connector.
  9. If wiring and engine systems check good, replace Bank 2 Sensor 3 with OE-correct sensor. Clear codes and test drive to confirm resolution.
  10. If code returns after new sensor, consider PCM update/diagnosis or investigate less common causes (cross-contamination, aftermarket exhaust, internal engine issues).

Likely causes

  • Damaged/contaminated Bank 2 Sensor 3
  • Wiring/connector fault (short to ground or intermittent open)
  • Exhaust leak near sensor or manifold leaking on bank 2
  • Upstream sensor or fuel/air trim issue causing sensor bias

Fault status

⚠️ Status
O2 Sensor Signal Biased/Stuck Lean — Bank 2 Sensor 3. Downstream oxygen sensor is reporting a persistent lean/low signal or out-of-range wideband reading compared to expected values.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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