What Does P1407 Mean?
The EGR temperature sensor is reading abnormally low temperatures, indicating either sensor failure or insufficient EGR gas temperature. The PCM uses this sensor to verify proper EGR operation and temperature.
Common Causes
40%
EGR temperature sensor failure or internal short circuit
25%
Wiring harness short to ground or damaged wiring
20%
EGR valve stuck open causing excessive cooling
10%
Poor electrical connector contact or corrosion
5%
PCM internal fault in sensor circuit
Diagnostic Steps
1
Step 1: Inspect EGR temperature sensor connector for corrosion, moisture, or damage
2
Step 2: Measure EGR temperature sensor resistance with engine cold (compare to specifications)
3
Step 3: Check wiring harness for shorts to ground using multimeter
4
Step 4: Start engine and monitor live data for EGR temperature sensor readings during warm-up
5
Step 5: Replace EGR temperature sensor if resistance or voltage readings are out of specification
Estimated Repair Cost
$120 - $400
Parts + labor, varies by vehicle and location
The EGR temperature sensor is reading abnormally low temperatures, indicating either sensor failure or insufficient EGR gas temperature. The PCM uses this sensor to verify proper EGR operation and temperature.
The most common cause of P1407 (EGR Temperature Sensor Signal Too Low) is: EGR temperature sensor failure or internal short circuit
Typical repair costs for P1407 range from $120 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but may experience poor drivability and increased emissions. Repair soon to prevent catalyst damage and maintain performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1407 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (EGR)
Difficulty
Type
Manufacturer
Recommended Tools
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