P0237 on Audi: Causes, Symptoms and Fix Cost

Quick Answer

Not safe to drive

P0237 on a Audi means the boost pressure sensor's signal voltage has fallen under the lowest value the engine computer will accept, so the computer reads an impossibly low boost pressure, stops trusting the sensor and usually limits power. Unlike P0299, it does not mean the turbo is really making too little boost. It is usually an electrical fault: an unplugged or corroded connector, a broken 5 V supply wire, a signal wire shorted to ground, or a failed sensor.

Severity: Moderate · Fuel System

Connect a standard OBD2 adapter (Bluetooth LE on iPhone) to your Audi and Skanyx tells you what P0237 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.

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What does P0237 mean on a Audi?

The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0237.

Audi A3

2009-2024

Volkswagen group diagnostics log P0237 as "Manifold Pressure / Boost Sensor (G31): Signal too Low" and list the A3 with the 2.0 common-rail TDI among the affected cars. The causes listed are the sensor's power supply and the sensor itself, so test the supply and connector before buying a sensor.

What causes P0237 on a Audi?

Beyond the generic causes listed on the main P0237 page, these are the patterns noted for Audi models:

Faulty manifold pressure / boost sensor (G31)
: Audi A3
Faulty power supply to the boost sensor
: Audi A3

How to diagnose P0237 on a Audi with OBD2

Follow these steps to pinpoint the root cause of P0237:

Read all stored codes and the freeze frame. If P0299 is stored as well, check whether boost really was low before blaming the sensor. If other sensor circuit-low codes appear together, suspect a shared 5 V supply or ground rather than the boost sensor itself.
Switch the ignition on without starting the engine and read the boost or MAP value on a generic OBD2 reader, if your engine reports it. With nothing pressurising the intake it should match the air pressure outside, about 95 to 105 kPa near sea level. A figure close to zero confirms the low signal.
Look at the sensor plug: press it until it clicks, then check inside for green corrosion, water, oil and terminals that have backed out of the housing.
Follow the harness for chafing or a break where it runs near the turbo, brackets or the charge pipe.
With the ignition on, a multimeter should show about 5 V on the supply pin and a good ground. No supply points to a wiring or supply fault, and a good supply with a dead signal points to the sensor.
Where the sensor is easy to reach, unplug it with the ignition on and watch the reading. On many engines the computer pulls an open signal line high, so a reading that jumps to maximum shows the wiring back to the computer is intact and the sensor itself is dragging the signal down. A reading that stays near zero with the sensor unplugged points to a signal wire shorted to ground in the harness.
After the repair, clear the code and road-test under load, confirming the boost reading rises smoothly and the code stays away.

How much does P0237 cost to fix on a Audi? (EUR)

Estimated repair costs for P0237 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.

Repair	Parts Cost	Labor Cost	Total Estimate	DIY Difficulty
Clean and reseat boost sensor connector	€0–€10	€0–€40	€0–€50	Easy
Replace boost pressure sensor	€20–€80	€20–€60	€40–€140	Easy
Repair sensor supply, ground or signal wire or connector pins	€10–€40	€60–€180	€70–€220	Moderate
ECU diagnosis and replacement, worst case only	€400–€1200	€100–€250	€500–€1450	Professional

Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.

These codes are often seen alongside P0237 or point to related issues, on any make:

Looking for the full P0237 reference (all makes, full diagnosis flow, complete repair cost matrix)? See the main P0237 guide

Diagnose P0237 on your Audi

Your car logged P0237. 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.