P040D: Exhaust Gas Recirculation Temperature Sensor "A" Circuit High
2 vehicles · 2 makes · $350-$1,500 repair
Most Reported On
P040D is an OBD-II diagnostic trouble code meaning “Exhaust Gas Recirculation Temperature Sensor "A" Circuit High.” This code means the engine computer detected an abnormally high voltage on the circuit for EGR temperature sensor 'A'. This sensor measures the temperature of exhaust gases moving through the EGR system (often around the EGR cooler) to confirm the system is flowing and to protect components from overheating. A high-circuit reading usually points to a sensor or wiring problem rather than an actual overheat. It typically triggers the check engine light and may affect emissions and EGR operation. This code is most commonly reported on 2010-2020 Skoda Octavia (Active, Ambition, Elegance, Style, L&K, RS), and 2019-2025 Toyota RAV4 (Hybrid LE, Hybrid XLE, Hybrid XSE, Hybrid Limited, Hybrid Woodland, Prime SE, Prime XSE), with repair costs ranging from $350 to $1,500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P040D, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P040D mean?
P040D stands for "Exhaust Gas Recirculation Temperature Sensor "A" Circuit High." This code means the engine computer detected an abnormally high voltage on the circuit for EGR temperature sensor 'A'. This sensor measures the temperature of exhaust gases moving through the EGR system (often around the EGR cooler) to confirm the system is flowing and to protect components from overheating. A high-circuit reading usually points to a sensor or wiring problem rather than an actual overheat. It typically triggers the check engine light and may affect emissions and EGR operation.
What are the most common causes of P040D?
The most common causes of P040D are: Faulty EGR temperature sensor (sensor A), Open circuit or broken wire in the sensor circuit, Corroded, loose, or disconnected connector, Wiring shorted to a high-reference voltage, Poor sensor ground, Failing PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P040D?
Repair costs for P040D range from $350 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by P040D?
Au7o has documented P040D across 2 vehicle models from 2 manufacturers: Skoda, Toyota.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.