Emissions

P2080 — Exhaust Gas Temperature Sensor Range/Performance (Bank 1 Sensor 1)

Severity: medium Drive with care, to a shop

What P2080 means

The engine control unit compares the signal from the first exhaust gas temperature (EGT) sensor on bank 1 with a modeled temperature and with other sensors. This sensor usually sits before the turbo or before the oxidation catalyst or diesel particulate filter. If the reading is out of range or does not follow engine load, the ECU sets P2080 and may abort DPF regeneration.

Symptoms

  • Check Engine light or DPF warning on
  • Regeneration aborted or not starting
  • Reduced power or limp mode
  • Higher fuel consumption
  • Frequent regeneration attempts, burnt smell from the exhaust

Possible causes

  1. Failed EGT sensor
  2. Open, corroded or shorted wiring or connector
  3. Exhaust leak near the sensor
  4. Real overheating during regeneration
  5. Clogged particulate filter or catalyst
  6. ECU fault (rare)

How to diagnose

  1. Read all codes and freeze frame data, noting related DPF, pressure and other EGT sensor codes
  2. Inspect the sensor, harness and connector for damage, corrosion or heat marks
  3. Check the exhaust for leaks near the sensor and upstream of the turbo
  4. Compare live data with the other EGT sensors on a cold engine; they should be close to ambient temperature
  5. Test sensor resistance and wiring continuity, and check supply and ground per the wiring diagram
  6. Confirm the temperature rises smoothly with warm-up and load
  7. Assess the particulate filter condition and its differential pressure
  8. Clear the code and road test or run a forced regeneration to verify

Common fixes

  • Replace the EGT sensor
  • Repair the wiring or connector
  • Fix exhaust leaks or replace the damaged section or gasket
  • Clean or replace a clogged particulate filter
  • Correct the cause of overheating (injectors, fuel delivery, turbo)

Questions and answers

What does P2080 mean?

The ECU found the first exhaust gas temperature sensor signal on bank 1 out of range or implausible. The cause can be the sensor, its wiring or a real overheat.

Can I drive with P2080?

For a short time, yes, but do not put it off. Regeneration may not work properly, and real overheating can damage the turbo or particulate filter.

Will replacing the sensor fix it?

Not always. Check the wiring, exhaust leaks and filter condition first, because a new sensor will not clear the code if the cause lies elsewhere.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.