Emissions

P2473 — Exhaust Gas Temperature Sensor Circuit High (Bank 1 Sensor 1)

Severity: medium Drive with care, to a shop

What P2473 means

The engine control module constantly reads the voltage from the exhaust gas temperature (EGT) sensor, which sits upstream of the turbo or aftertreatment. P2473 is set when that signal stays above the allowed range, usually due to an open circuit, poor connection or a failed sensor. Without a reliable temperature reading, the module cannot manage particulate filter regeneration or protect the turbo properly.

Symptoms

  • Check engine light on
  • Additional DPF-related codes
  • Reduced power or limp mode
  • Failed or missing filter regenerations
  • Higher fuel consumption
  • Smoky exhaust

Possible causes

  1. Open circuit in the EGT sensor wiring
  2. Failed exhaust gas temperature sensor
  3. Broken or chafed wire near the exhaust flex pipe
  4. Corroded or damaged sensor connector
  5. Open signal or ground wire in the harness
  6. Rarely, a faulty control module

How to diagnose

  1. Scan all codes and freeze frame data, noting any DPF codes or other EGT sensor codes
  2. Inspect the sensor, connector and harness for heat damage, breaks and corrosion, especially near the flex pipe
  3. Check live EGT data on a cold engine; it should be close to ambient temperature
  4. Unplug the connector and check for reference voltage and wire continuity back to the module
  5. Test the ground and signal wires for opens with a multimeter
  6. Measure the sensor resistance and compare it to the manufacturer spec
  7. Clear the code after repair and confirm it does not return

Common fixes

  • Replace the exhaust gas temperature sensor
  • Repair or replace the damaged harness wire
  • Clean or replace the connector
  • Re-secure the harness away from hot exhaust parts
  • Reflash or replace the control module only if confirmed faulty

Questions and answers

What does P2473 mean?

It means the first EGT sensor on bank 1 is reporting a high signal or an open circuit. The control module is not getting valid exhaust temperature data.

Can I drive with code P2473?

For a short time, yes, but don't put the repair off. DPF regeneration may fail and power may be limited, and without temperature monitoring there is a greater risk of overheating the turbo.

How do I fix P2473?

Most often it is a broken wire or poor connection at the connector; otherwise the EGT sensor needs replacing. Start by inspecting the harness near the exhaust flex pipe.

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.