P0108 on Toyota: Causes, Symptoms and Fix Cost
Quick Answer
Not safe to drive
P0108 on a Toyota means the signal from the MAP (Manifold Absolute Pressure) sensor is above the highest value the engine computer accepts, on many petrol engines a voltage close to the sensor's 5 V supply. The computer reads that as a pressure the engine cannot reach, so it stops trusting the sensor. This is different from P0107, where the signal sits at the bottom of the scale, and from P0106, where the signal is in range but does not fit engine conditions. A wiring fault, an open sensor ground, a bad connector or a dead sensor are the usual causes, and a new sensor or a wiring repair costs roughly 40 to 220 euros fitted.
- Severity
- Moderate · Emissions
Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Toyota and Skanyx tells you what P0108 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat does P0108 mean on a Toyota?
The Quick Answer above is the generic definition. What follows is the model-specific detail for the Toyota models that log P0108.
Toyota Hilux 2.5 D-4D and 3.0 D-4D (2KD-FTV, 1KD-FTV)
2004-2015
Toyota's repair manual for the Hilux D-4D diesels sets P0108 for an open or short in the MAP sensor circuit lasting 0.5 seconds or more. With the ignition on the sensor should read the same as outside air pressure, and a reading of 250 kPa or more points to an open or short in the 5 V supply, or an open in the signal or ground wire. Because this sensor also measures boost, it puts out only 2.4 to 3.1 V at outside air pressure, so voltage figures quoted for petrol cars do not apply.
What causes P0108 on a Toyota?
Beyond the generic causes listed on the main P0108 page, these are the patterns noted for Toyota models:
Open in the sensor's 5 V supply, signal or ground circuit
: Toyota Hilux 2.5 D-4D and 3.0 D-4D (2KD-FTV, 1KD-FTV)
Faulty manifold absolute pressure sensor
: Toyota Hilux 2.5 D-4D and 3.0 D-4D (2KD-FTV, 1KD-FTV)
How to diagnose P0108 on a Toyota with OBD2
Follow these steps to pinpoint the root cause of P0108:
- Read all stored codes and the freeze frame. Fix any shared 5 V reference or ground codes first, because several sensors on the same supply fail together. A generic OBD2 reader shows the codes, the freeze frame and the standard MAP reading in kPa where the engine computer reports it.
- With the ignition on and the engine off, the MAP reading should match the outside air pressure, roughly 100 kPa at sea level. A reading far above that on a parked engine, for example 250 kPa, confirms a circuit or sensor fault. Some cars show a fixed substitute value instead once the code has set.
- Check the connector for corrosion, water and bent pins, and the harness for chafing or a wire shorted to a power supply.
- With the ignition on, measure the 5 V reference at the connector. It should be close to 5 V, and a reading well above that suggests a short to voltage.
- Check the sensor ground (low reference) for continuity to the engine computer. An open ground makes the signal read high on many engines.
- Check the signal wire for a short to voltage and for an open circuit. Which wiring faults read high or low depends on the make, so use the workshop manual for the car.
- If the reference, ground and signal wiring are good and the sensor reads wrong, replace the sensor, then clear the code and road-test.
How much does P0108 cost to fix on a Toyota? (EUR)
Estimated repair costs for P0108 in EUR, compiled across makes. Toyota costs typically sit in the middle of each range.
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Clean and reseat MAP sensor connector | €0–€10 | €0–€40 | €0–€50 | Easy |
| Replace MAP sensor | €20–€100 | €20–€60 | €40–€160 | Easy |
| Replace turbo boost (MAP) sensor on a turbo petrol or diesel | €30–€130 | €30–€90 | €60–€220 | Moderate |
| Repair MAP sensor wiring or connector | €10–€40 | €60–€180 | €70–€220 | Moderate |
| Workshop diagnosis (live data and circuit tests) | €0–€0 | €30–€80 | €30–€80 | Professional |
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0108
These codes are often seen alongside P0108 or point to related issues, on any make:
Looking for the full P0108 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0108 guide
Diagnose P0108 on your Toyota
Your car logged P0108. Skanyx reads it on a standard OBD2 adapter (Bluetooth LE on iPhone), tells you whether it is safe to keep driving, and breaks down the likely repair so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.
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