P040D on Skoda
Exhaust Gas Recirculation Temperature Sensor "A" Circuit High
P040D on Skoda vehicles indicates exhaust gas recirculation temperature sensor "a" circuit high. Au7o has documented this code across 1 Skoda model — most commonly on Octavia. 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. Typical repair costs on Skoda range from $500 to $1,400, depending on the specific model and root cause.
Common Causes of P040D
- •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)
P040D on Skoda by Model
Skoda Octavia(1 issue)
- 2.0 TDI EGR Cooler Failure (Dieselgate-Era Engines)2010-2020
Octavia 2.0 TDI engines (EA189 pre-2015 emissions update + EA288 post-Dieselgate) suffer EGR cooler failure where the cooler's internal coolant tubes crack. This leaks coolant into the intake manifold, causing white smoke, coolant loss, and eventual hydrolock. Compounded by post-Dieselgate emissions software update that increased EGR duty cycle, accelerating cooler stress. Class action across EU.
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View P040D across all makes →Frequently Asked Questions
What does P040D mean on Skoda?▼
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. On Skoda specifically, this code is documented across 1 model.
What causes P040D on Skoda vehicles?▼
Common causes on Skoda: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P040D on a Skoda?▼
Repair costs on Skoda range from $500 to $1,400, depending on the specific model and root cause.
Which Skoda models have P040D documented?▼
Au7o has documented P040D on 1 Skoda model: Octavia.