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Home / DTC / P013C — O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2

P013C — O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2

Detailed page for trouble code P013C.

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22,491specific
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Code

P013C

Generic P — Powertrain

O2 Sensor Slow Response - Rich to Lean Bank 2 Sensor 2

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

Causes

  • Aging or contaminated bank 2 downstream oxygen sensor (sensor 2)
  • Wiring problems: open, short, high resistance, or intermittent connection on sensor circuit
  • Connector corrosion, poor terminal contact, or water intrusion at the harness connector
  • Exhaust leaks upstream of the sensor altering gas composition
  • Engine management issues causing abnormal exhaust composition (rich running)
  • Contamination from coolant, oil, silicone, or fuel additives on the sensor element

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced fuel economy
  • Failed emissions test or elevated tailpipe emissions
  • Possible rough idle or slight drivability issues if closed-loop control is affected
  • Stored freeze frame data showing rich-to-lean transition conditions

What to check

  • Retrieve freeze frame and live data with a scan tool; confirm P013C and relevant readiness/PCM data
  • Inspect wiring and connector for Bank 2 Sensor 2 for damage, corrosion, or water intrusion
  • Visually inspect exhaust for leaks, especially between the downstream sensor and catalytic converter
  • Check upstream sensor(s) and fuel trim data — abnormal upstream behavior can affect downstream response
  • Perform a smoke test or pressure test for exhaust leaks if visual inspection is inconclusive
  • Compare sensor response to commanded conditions using live PID graphs (voltage vs time) during rich/lean events

Signal parameters

  • Downstream O2 sensor (Sensor 2) typical voltage range: ~0.1 V (lean) to ~0.9 V (rich) for narrowband sensors; wideband will show lambda/current/voltage per manufacturer
  • Expected transition time: voltage should drop from rich to lean quickly (within a few hundred milliseconds to a few seconds depending on engine and sensor type) after the mixture changes
  • Heater circuit: resistance typically a few ohms to tens of ohms (refer to service data); voltage to heater should show battery voltage with engine running
  • If wideband, expect the controller output/current to change promptly with air/fuel ratio shifts

Diagnostic algorithm

  1. Connect a scan tool and confirm P013C is set and check freeze frame and live data for Bank 2 Sensor 2 during rich→lean events.
  2. Compare Bank 1 and Bank 2 downstream sensor behavior. If only Bank 2 is slow, suspect sensor or local wiring/exhaust issues.
  3. Visually inspect the sensor harness and connector for damage, corrosion, loose pins, or contamination. Repair as needed.
  4. Measure heater circuit resistance and supply voltage per service data. Verify heater operation (presence of voltage/current while key on/engine running).
  5. Backprobe sensor signal with a DVOM or oscilloscope. Observe voltage waveform during steady state and during induced rich/lean transitions (snap throttle or fuel enrichment test). Look for sluggish transition compared with spec or other bank.
  6. Check for exhaust leaks upstream of the sensor and repair any leaks found. Re-test after repair.
  7. If wiring and exhaust are good but response is still slow, replace Bank 2 Sensor 2 with OEM-equivalent sensor and clear codes; perform drive cycles to confirm code does not return.
  8. If code returns after sensor replacement, inspect PCM grounds, other engine systems affecting mixture (fuel pressure, injectors, MAF), and consider PCM/conductor issues.

Likely causes

  • Failed or degraded Bank 2 Sensor 2 (slow response)
  • Damaged wiring or connector at Bank 2 Sensor 2
  • Exhaust leak between catalytic converter and sensor
  • Contamination of sensor from oil/coolant or silicone-based sealants

Fault status

⚠️ Status
O2 Sensor Slow Response - Rich to Lean (Bank 2 Sensor 2)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P013C

LAND ROVER P — Powertrain

Heated oxygen sensor - Slow response - Lean rich - Sensor 2 of Bank 2

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

Causes

  • Aging or contaminated bank 2 downstream oxygen sensor (sensor 2)
  • Wiring problems: open, short, high resistance, or intermittent connection on sensor circuit
  • Connector corrosion, poor terminal contact, or water intrusion at the harness connector
  • Exhaust leaks upstream of the sensor altering gas composition
  • Engine management issues causing abnormal exhaust composition (rich running)
  • Contamination from coolant, oil, silicone, or fuel additives on the sensor element

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced fuel economy
  • Failed emissions test or elevated tailpipe emissions
  • Possible rough idle or slight drivability issues if closed-loop control is affected
  • Stored freeze frame data showing rich-to-lean transition conditions

What to check

  • Retrieve freeze frame and live data with a scan tool; confirm P013C and relevant readiness/PCM data
  • Inspect wiring and connector for Bank 2 Sensor 2 for damage, corrosion, or water intrusion
  • Visually inspect exhaust for leaks, especially between the downstream sensor and catalytic converter
  • Check upstream sensor(s) and fuel trim data — abnormal upstream behavior can affect downstream response
  • Perform a smoke test or pressure test for exhaust leaks if visual inspection is inconclusive
  • Compare sensor response to commanded conditions using live PID graphs (voltage vs time) during rich/lean events

Signal parameters

  • Downstream O2 sensor (Sensor 2) typical voltage range: ~0.1 V (lean) to ~0.9 V (rich) for narrowband sensors; wideband will show lambda/current/voltage per manufacturer
  • Expected transition time: voltage should drop from rich to lean quickly (within a few hundred milliseconds to a few seconds depending on engine and sensor type) after the mixture changes
  • Heater circuit: resistance typically a few ohms to tens of ohms (refer to service data); voltage to heater should show battery voltage with engine running
  • If wideband, expect the controller output/current to change promptly with air/fuel ratio shifts

Diagnostic algorithm

  1. Connect a scan tool and confirm P013C is set and check freeze frame and live data for Bank 2 Sensor 2 during rich→lean events.
  2. Compare Bank 1 and Bank 2 downstream sensor behavior. If only Bank 2 is slow, suspect sensor or local wiring/exhaust issues.
  3. Visually inspect the sensor harness and connector for damage, corrosion, loose pins, or contamination. Repair as needed.
  4. Measure heater circuit resistance and supply voltage per service data. Verify heater operation (presence of voltage/current while key on/engine running).
  5. Backprobe sensor signal with a DVOM or oscilloscope. Observe voltage waveform during steady state and during induced rich/lean transitions (snap throttle or fuel enrichment test). Look for sluggish transition compared with spec or other bank.
  6. Check for exhaust leaks upstream of the sensor and repair any leaks found. Re-test after repair.
  7. If wiring and exhaust are good but response is still slow, replace Bank 2 Sensor 2 with OEM-equivalent sensor and clear codes; perform drive cycles to confirm code does not return.
  8. If code returns after sensor replacement, inspect PCM grounds, other engine systems affecting mixture (fuel pressure, injectors, MAF), and consider PCM/conductor issues.

Likely causes

  • Failed or degraded Bank 2 Sensor 2 (slow response)
  • Damaged wiring or connector at Bank 2 Sensor 2
  • Exhaust leak between catalytic converter and sensor
  • Contamination of sensor from oil/coolant or silicone-based sealants

Fault status

⚠️ Status
O2 Sensor Slow Response - Rich to Lean (Bank 2 Sensor 2)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0130 P0131 P0132 P0133 P0134 P0135
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