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Home / DTC / P2081 — Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 1

P2081 — Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 1

Detailed page for trouble code P2081.

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Code

P2081

Generic P — Powertrain

Exhaust Gas Temperature Sensor Circuit Intermittent Bank 1 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 21 EN: 32 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged, loose, corroded or contaminated sensor connector or pins
  • Broken, chafed or shorting wiring harness between the EGT sensor and ECU
  • Intermittent internal failure of the EGT sensor (thermocouple/thermistor)
  • Intermittent ECM/PCM input or grounding issue
  • Exhaust leak near the sensor causing abnormal readings or transient conditions
  • Poor sensor mounting or contamination (soot, oil) causing intermittent contacts

Symptoms

  • Check Engine Light (MIL) may be on; code P2081 stored
  • Intermittent or transient performance issues related to exhaust temp control (turbo boost, regeneration)
  • Possible reduced performance, altered regen timing, or limp-home logic on some vehicles
  • No consistent symptom if fault is intermittent

What to check

  • Read/record freeze frame and full scan-tool data (live EGT signal, heater command if present)
  • Visual inspection of Bank 1 Sensor 1 connector, pins and wiring for corrosion, heat damage, soot, or loose terminals
  • Wiggle test harness and connector while monitoring live EGT signal for dropouts
  • Backprobe the sensor signal and ground with a scan tool or digital scope to observe signal continuity and noise
  • Verify sensor and harness are routed and secured away from exhaust heat sources and moving parts
  • Inspect for nearby exhaust leaks that could cause abnormal readings

Signal parameters

  • EGT sensor type varies by application: thermocouple sensors produce a low-level millivolt signal that increases smoothly with temperature (no abrupt dropouts)
  • If sensor includes a heater, heater should show battery voltage or PWM when commanded; heater resistance typically low (consult vehicle spec)
  • Expected behavior: steady rise in measured signal as exhaust heats; no intermittent open/shorts or erratic spikes

Diagnostic algorithm

  1. Connect a capable scan tool and note freeze frame, frequency of code, and live EGT readings. 2. Visually inspect Bank 1 Sensor 1 connector, pins and wiring for corrosion, water intrusion, heat damage, or loose terminals; repair any issues. 3. Clear codes and perform a road or dyno test while monitoring the EGT signal; wiggle the harness at suspect points to reproduce the intermittent fault. 4. Backprobe the signal and ground terminals with a multimeter and preferably an oscilloscope to look for intermittent signal dropouts, noise, or open/short events. 5. Measure continuity and resistance between the sensor connector and the ECU pin with key off; check for intermittent opens by flexing the harness. 6. If sensor has heater, verify heater supply and ground when commanded; measure heater resistance against spec. 7. If wiring and connector are good but intermittent persists, swap with a known-good sensor if available or replace the EGT sensor. 8. If problem remains after sensor replacement, check ECU connector/pins and grounds; consider ECU fault if wiring and sensor checks pass. 9. After repairs, clear codes and perform verification drive cycles to ensure the intermittent fault is resolved.

Likely causes

  • Corroded/loose connector or pin on the EGT sensor
  • Chafed wiring or intermittent break in harness near exhaust/clamps
  • Degraded/failed EGT sensor element causing intermittent output

Fault status

⚠️ Status
Intermittent fault detected in Exhaust Gas Temperature Sensor Circuit — Bank 1 Sensor 1. Signal intermittently open/short or erratic; intermittent DTC stored. May require monitoring to reproduce.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2080 P2082 P2083 P2084 P2195
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Code

P2081

LAND ROVER P — Powertrain

Intermittent circuit of the exhaust gas temperature sensor - bank 1, sensor 1

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 8 EN: 18 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged, loose, corroded or contaminated sensor connector or pins
  • Broken, chafed or shorting wiring harness between the EGT sensor and ECU
  • Intermittent internal failure of the EGT sensor (thermocouple/thermistor)
  • Intermittent ECM/PCM input or grounding issue
  • Exhaust leak near the sensor causing abnormal readings or transient conditions
  • Poor sensor mounting or contamination (soot, oil) causing intermittent contacts

Symptoms

  • Check Engine Light (MIL) may be on; code P2081 stored
  • Intermittent or transient performance issues related to exhaust temp control (turbo boost, regeneration)
  • Possible reduced performance, altered regen timing, or limp-home logic on some vehicles
  • No consistent symptom if fault is intermittent

What to check

  • Read/record freeze frame and full scan-tool data (live EGT signal, heater command if present)
  • Visual inspection of Bank 1 Sensor 1 connector, pins and wiring for corrosion, heat damage, soot, or loose terminals
  • Wiggle test harness and connector while monitoring live EGT signal for dropouts
  • Backprobe the sensor signal and ground with a scan tool or digital scope to observe signal continuity and noise
  • Verify sensor and harness are routed and secured away from exhaust heat sources and moving parts
  • Inspect for nearby exhaust leaks that could cause abnormal readings

Signal parameters

  • EGT sensor type varies by application: thermocouple sensors produce a low-level millivolt signal that increases smoothly with temperature (no abrupt dropouts)
  • If sensor includes a heater, heater should show battery voltage or PWM when commanded; heater resistance typically low (consult vehicle spec)
  • Expected behavior: steady rise in measured signal as exhaust heats; no intermittent open/shorts or erratic spikes

Diagnostic algorithm

  1. Connect a capable scan tool and note freeze frame, frequency of code, and live EGT readings. 2. Visually inspect Bank 1 Sensor 1 connector, pins and wiring for corrosion, water intrusion, heat damage, or loose terminals; repair any issues. 3. Clear codes and perform a road or dyno test while monitoring the EGT signal; wiggle the harness at suspect points to reproduce the intermittent fault. 4. Backprobe the signal and ground terminals with a multimeter and preferably an oscilloscope to look for intermittent signal dropouts, noise, or open/short events. 5. Measure continuity and resistance between the sensor connector and the ECU pin with key off; check for intermittent opens by flexing the harness. 6. If sensor has heater, verify heater supply and ground when commanded; measure heater resistance against spec. 7. If wiring and connector are good but intermittent persists, swap with a known-good sensor if available or replace the EGT sensor. 8. If problem remains after sensor replacement, check ECU connector/pins and grounds; consider ECU fault if wiring and sensor checks pass. 9. After repairs, clear codes and perform verification drive cycles to ensure the intermittent fault is resolved.

Likely causes

  • Corroded/loose connector or pin on the EGT sensor
  • Chafed wiring or intermittent break in harness near exhaust/clamps
  • Degraded/failed EGT sensor element causing intermittent output

Fault status

⚠️ Status
Intermittent fault detected in Exhaust Gas Temperature Sensor Circuit — Bank 1 Sensor 1. Signal intermittently open/short or erratic; intermittent DTC stored. May require monitoring to reproduce.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Contents
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  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
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Code

P2081

MERCEDES-BENZ P — Powertrain

Exhaust Gas Temperature Sensor Circuit intermittant (Bank 1 Sensor 1)

Brand: MERCEDES-BENZ
Type: P — Powertrain
Views: UK: 12 EN: 22 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged, loose, corroded or contaminated sensor connector or pins
  • Broken, chafed or shorting wiring harness between the EGT sensor and ECU
  • Intermittent internal failure of the EGT sensor (thermocouple/thermistor)
  • Intermittent ECM/PCM input or grounding issue
  • Exhaust leak near the sensor causing abnormal readings or transient conditions
  • Poor sensor mounting or contamination (soot, oil) causing intermittent contacts

Symptoms

  • Check Engine Light (MIL) may be on; code P2081 stored
  • Intermittent or transient performance issues related to exhaust temp control (turbo boost, regeneration)
  • Possible reduced performance, altered regen timing, or limp-home logic on some vehicles
  • No consistent symptom if fault is intermittent

What to check

  • Read/record freeze frame and full scan-tool data (live EGT signal, heater command if present)
  • Visual inspection of Bank 1 Sensor 1 connector, pins and wiring for corrosion, heat damage, soot, or loose terminals
  • Wiggle test harness and connector while monitoring live EGT signal for dropouts
  • Backprobe the sensor signal and ground with a scan tool or digital scope to observe signal continuity and noise
  • Verify sensor and harness are routed and secured away from exhaust heat sources and moving parts
  • Inspect for nearby exhaust leaks that could cause abnormal readings

Signal parameters

  • EGT sensor type varies by application: thermocouple sensors produce a low-level millivolt signal that increases smoothly with temperature (no abrupt dropouts)
  • If sensor includes a heater, heater should show battery voltage or PWM when commanded; heater resistance typically low (consult vehicle spec)
  • Expected behavior: steady rise in measured signal as exhaust heats; no intermittent open/shorts or erratic spikes

Diagnostic algorithm

  1. Connect a capable scan tool and note freeze frame, frequency of code, and live EGT readings. 2. Visually inspect Bank 1 Sensor 1 connector, pins and wiring for corrosion, water intrusion, heat damage, or loose terminals; repair any issues. 3. Clear codes and perform a road or dyno test while monitoring the EGT signal; wiggle the harness at suspect points to reproduce the intermittent fault. 4. Backprobe the signal and ground terminals with a multimeter and preferably an oscilloscope to look for intermittent signal dropouts, noise, or open/short events. 5. Measure continuity and resistance between the sensor connector and the ECU pin with key off; check for intermittent opens by flexing the harness. 6. If sensor has heater, verify heater supply and ground when commanded; measure heater resistance against spec. 7. If wiring and connector are good but intermittent persists, swap with a known-good sensor if available or replace the EGT sensor. 8. If problem remains after sensor replacement, check ECU connector/pins and grounds; consider ECU fault if wiring and sensor checks pass. 9. After repairs, clear codes and perform verification drive cycles to ensure the intermittent fault is resolved.

Likely causes

  • Corroded/loose connector or pin on the EGT sensor
  • Chafed wiring or intermittent break in harness near exhaust/clamps
  • Degraded/failed EGT sensor element causing intermittent output

Fault status

⚠️ Status
Intermittent fault detected in Exhaust Gas Temperature Sensor Circuit — Bank 1 Sensor 1. Signal intermittently open/short or erratic; intermittent DTC stored. May require monitoring to reproduce.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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