Code
P014A
Generic
P — Powertrain
O2 Sensor Delayed Response - Rich to Lean Bank 2 Sensor 2
Views:
UK: 19
EN: 19
RU: 19
AI status
Completed
Completed
100%
Causes
- Aging or contaminated Bank 2 Sensor 2 (post‑catalyst O2 sensor)
- Faulty sensor heater or heater circuit (open, shorted, or intermittent)
- Wiring harness damage, poor connector contact or corrosion at sensor connector
- Exhaust leak downstream of the sensor causing abnormal readings
- Degraded or clogged catalytic converter reducing sensor exposure to real exhaust changes
- PCM bias/ground issue or software anomaly (less common)
Symptoms
- Check Engine Light (MIL) illuminated
- Failed emissions test or elevated tailpipe HC/CO readings
- Possible reduced catalyst efficiency (P0420 may also set)
- No significant drivability change in many cases (post‑cat sensor usually does not control fuel trim)
- Occasional poor fuel economy if sensor issues affect fuel control indirectly
What to check
- Read freeze frame and pending codes; confirm P014A is current
- Scan live O2 sensor voltages for Bank 2 Sensor 2 and compare with Bank 2 Sensor 1 (upstream)
- Check heater circuit: monitor voltage and ground, measure heater resistance with sensor unplugged
- Visually inspect sensor, wiring harness and connector for damage, corrosion, or pin pull
- Check for exhaust leaks downstream of the catalytic converter and around sensor threads
- Inspect catalyst condition (excessive backpressure, rattling, discoloration) if available
Signal parameters
- Narrow‑band O2 sensor (typical): voltage swings ~0.1–0.9 V between lean and rich
- Downstream (Sensor 2) may be steadier than upstream but should still reflect transitions shortly after engine condition changes
- Expected rich→lean transition time: sensor should cross threshold quickly (often well under a few hundred ms); prolonged delay triggers P014A
- Heater resistance: varies by manufacturer; commonly low ohms (few ohms to tens of ohms) — consult vehicle spec
- Heater supply: should see battery/ignition voltage at connector with PCM commanded on; PCM may pulse ground to control heater
Diagnostic algorithm
- Use a scan tool to confirm P014A and view live data for Bank 2 Sensor 1 (upstream) and Sensor 2 (downstream). Note response characteristics during throttle blips or commanded fuel changes.
- Induce a controlled rich→lean change (snap throttle or brief vacuum change) while monitoring both sensors. Verify upstream sensor responds quickly and downstream lags longer than expected.
- Inspect sensor and harness visually. Wiggle test wiring while watching live data for intermittent faults.
- With ignition off, unplug sensor and measure heater resistance to ground and between heater pins; compare to spec. Check continuity of signal and ground circuits to PCM.
- Backprobe sensor signal with an oscilloscope or graphing scan tool during transitions to quantify response time and amplitude.
- Check for exhaust leaks downstream of sensor and inspect catalytic converter for damage or clogging that might slow gas exchange.
- If wiring and heater are good but sensor response is slow, swap sensor (if identical available) or replace Bank 2 Sensor 2 and re-test. Do not forget to clear codes and perform drive cycle.
- If new sensor shows same slow response, inspect PCM grounds and compare behavior on the opposite bank; consider catalyst replacement if catalyst is proven degraded.
- After repair, verify sensor switching behavior, complete readiness monitors and confirm MIL does not return.
Likely causes
- Contaminated or failed Bank 2 Sensor 2 (most common)
- Open/short or high resistance in sensor heater circuit or signal circuit
- Connector corrosion or poor pin contact at sensor connector
- Exhaust leak downstream of Bank 2 Sensor 2
- Catalytic converter degradation on Bank 2
Fault status
Status
O2 Sensor Delayed Response — Rich to Lean, Bank 2 Sensor 2. PCM detected slower than expected transition of the post‑catalyst oxygen sensor when mixture changes from rich to lean.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Workshop Manuals
Available brands with manuals
2
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Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
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Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
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Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
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LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P014A
LAND ROVER
P — Powertrain
Heated oxygen sensor - Delayed response - Rich lean - Bank 2 sensor 2
Views:
UK: 7
EN: 6
RU: 8
AI status
Completed
Completed
100%
Causes
- Aging or contaminated Bank 2 Sensor 2 (post‑catalyst O2 sensor)
- Faulty sensor heater or heater circuit (open, shorted, or intermittent)
- Wiring harness damage, poor connector contact or corrosion at sensor connector
- Exhaust leak downstream of the sensor causing abnormal readings
- Degraded or clogged catalytic converter reducing sensor exposure to real exhaust changes
- PCM bias/ground issue or software anomaly (less common)
Symptoms
- Check Engine Light (MIL) illuminated
- Failed emissions test or elevated tailpipe HC/CO readings
- Possible reduced catalyst efficiency (P0420 may also set)
- No significant drivability change in many cases (post‑cat sensor usually does not control fuel trim)
- Occasional poor fuel economy if sensor issues affect fuel control indirectly
What to check
- Read freeze frame and pending codes; confirm P014A is current
- Scan live O2 sensor voltages for Bank 2 Sensor 2 and compare with Bank 2 Sensor 1 (upstream)
- Check heater circuit: monitor voltage and ground, measure heater resistance with sensor unplugged
- Visually inspect sensor, wiring harness and connector for damage, corrosion, or pin pull
- Check for exhaust leaks downstream of the catalytic converter and around sensor threads
- Inspect catalyst condition (excessive backpressure, rattling, discoloration) if available
Signal parameters
- Narrow‑band O2 sensor (typical): voltage swings ~0.1–0.9 V between lean and rich
- Downstream (Sensor 2) may be steadier than upstream but should still reflect transitions shortly after engine condition changes
- Expected rich→lean transition time: sensor should cross threshold quickly (often well under a few hundred ms); prolonged delay triggers P014A
- Heater resistance: varies by manufacturer; commonly low ohms (few ohms to tens of ohms) — consult vehicle spec
- Heater supply: should see battery/ignition voltage at connector with PCM commanded on; PCM may pulse ground to control heater
Diagnostic algorithm
- Use a scan tool to confirm P014A and view live data for Bank 2 Sensor 1 (upstream) and Sensor 2 (downstream). Note response characteristics during throttle blips or commanded fuel changes.
- Induce a controlled rich→lean change (snap throttle or brief vacuum change) while monitoring both sensors. Verify upstream sensor responds quickly and downstream lags longer than expected.
- Inspect sensor and harness visually. Wiggle test wiring while watching live data for intermittent faults.
- With ignition off, unplug sensor and measure heater resistance to ground and between heater pins; compare to spec. Check continuity of signal and ground circuits to PCM.
- Backprobe sensor signal with an oscilloscope or graphing scan tool during transitions to quantify response time and amplitude.
- Check for exhaust leaks downstream of sensor and inspect catalytic converter for damage or clogging that might slow gas exchange.
- If wiring and heater are good but sensor response is slow, swap sensor (if identical available) or replace Bank 2 Sensor 2 and re-test. Do not forget to clear codes and perform drive cycle.
- If new sensor shows same slow response, inspect PCM grounds and compare behavior on the opposite bank; consider catalyst replacement if catalyst is proven degraded.
- After repair, verify sensor switching behavior, complete readiness monitors and confirm MIL does not return.
Likely causes
- Contaminated or failed Bank 2 Sensor 2 (most common)
- Open/short or high resistance in sensor heater circuit or signal circuit
- Connector corrosion or poor pin contact at sensor connector
- Exhaust leak downstream of Bank 2 Sensor 2
- Catalytic converter degradation on Bank 2
Fault status
Status
O2 Sensor Delayed Response — Rich to Lean, Bank 2 Sensor 2. PCM detected slower than expected transition of the post‑catalyst oxygen sensor when mixture changes from rich to lean.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email
