What it means
The control module monitors the EGR sensor D signal for continuity. It sets this code when the signal drops out or changes erratically during operation.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
EGR sensor D provides a signal the control module monitors to assess an EGR-related condition; the sensor's exact role depends on the vehicle. This code sets when that signal drops out or changes erratically during operation, rather than remaining stable and continuous. A loose terminal, vibration-sensitive connector, or chafed or pinched harness can interrupt the signal intermittently.
Common causes
Most likely first.
- Intermittent contact at connector or terminal
- Harness chafed or pinched
- Connector with intermittent contact under vibration
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
How to diagnose it
- Record freeze-frame data and check whether EGR sensor D live data drops out when the fault appears.
- Locate sensor D and inspect its connector for loose fit, intermittent terminal contact, corrosion, or a pin that is not seated.
- Inspect the sensor D harness for chafing or pinching, especially where movement, heat, or vibration could disturb it.
- With live data monitored, carefully move the connector and harness to see whether the sensor signal changes during the manufacturer's diagnostic procedure.
- If the wiring and connector remain stable, test sensor D for an intermittent internal fault.
Common fixes
- Reseat and secure the EGR sensor D connector.
- Repair or replace a loose, corroded, or poorly retained terminal.
- Repair chafed or pinched sensor D wiring and secure the harness.
- Replace EGR sensor D if its signal still drops out with a sound circuit.
Can I keep driving?
If the engine runs normally, drive only as needed while arranging diagnosis; reduce driving if hesitation, knocking, or power loss occurs. Intermittent EGR feedback can affect drivability and emissions without warning.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.