P04E7: EGR Temperature Sensor D Circuit Low

Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. Sensor D is the fourth of up to four EGR temperature sensors, conceivable on engines with high- and low-pressure EGR and a sensor before and after each cooler; it is usually an NTC whose low voltage means hot. No manufacturer document available to us uses sensor D; the description follows CARB and Ford's checks on sensor B as a comparison. P04E7 means the signal is below its lower limit – a signal line shorted to ground or, theoretically, an extremely high temperature. For sensor B Ford uses below 0.19 V. A substitute value is used and EGR may be reduced.

Medium severity. Can I keep driving?You can normally drive in moderation, but get it repaired soon: if the valve is stuck open, the engine may idle very poorly.

Symptoms

Check engine light on
Usually no change in driving
EGR possibly reduced, higher NOx

Most likely causes

Signal line chafed against ground or the engine
Sensor shorted internally
Water or corrosion in the connector
Module input faulty

What to check, in order

Start with the simplest. You can tick off each step.

Check the connector and any vacuum hoses
With the connector unplugged, check whether the signal wire is making contact with ground.
Use live data to compare the commanded opening with the actual opening
Clean the valve and passages if they are clogged with carbon
Test the actuator with the scanner
Replace the valve if it still does not follow the command after cleaning

Good to know

Repair difficulty: medium
It affects emissions.

What each character of P04E7 means

P: Powertrain: engine and transmission
0: Generic code: same on every make
4: Emissions
E7: Specific fault in that system

Frequently asked questions

Can I keep driving with code P04E7?

You can normally drive in moderation, but get it repaired soon: if the valve is stuck open, the engine may idle very poorly.

What causes code P04E7?

The most common causes are: signal line chafed against ground or the engine; sensor shorted internally; water or corrosion in the connector.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.