The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P2187.
DTC/P2187·Audi
P2187 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Audi
P2187 on a Audi means the engine is running too lean specifically at idle speed on Bank 1. The fuel system is not delivering enough fuel relative to the amount of air entering the engine at low RPM. This is different from P0171, which indicates a lean condition across all operating ranges.
Typical repair cost, all makes€35 - €380
Connect any standard Bluetooth OBD2 adapter to your Audi and Skanyx tells you what P2187 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 P2187 mean on a Audi?
Audi A3
2005-2024The A3 with 1.4 TFSI and 2.0 TFSI engines shares the same PCV and vacuum leak issues as the VW Golf. On the A3 8P, check the brake servo vacuum hose, which runs under the intake manifold and is prone to cracking where it bends around the engine mount.
What causes P2187 on a Audi?
Beyond the generic causes listed on the main P2187 page, these are the patterns noted for Audi models:
Audi A3Brake servo vacuum hose cracking on 8P models
Audi A3Shared PCV valve failure with VW Golf
How to diagnose P2187 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P2187:
- With the engine idling, listen carefully for any hissing or whistling sounds around the intake manifold, vacuum hoses, and PCV system. A vacuum leak is a usual cause and is often audible.
- Use a smoke machine to pressurize the intake system and find vacuum leaks. Smoke will escape from any crack, split hose, or faulty gasket. Pay special attention to the intake manifold gasket and brake servo hose.
- Check the MAF sensor readings at idle using live data. Compare the actual airflow reading to the manufacturer's specification for your engine. A dirty MAF sensor will underreport airflow, causing the ECU to deliver too little fuel.
- Monitor short-term and long-term fuel trims at idle. Values above +10% confirm the ECU is adding fuel to compensate for a lean condition. If trims normalise at higher RPM, the leak is only significant at idle vacuum.
- If no vacuum leak or MAF issue is found, check fuel pressure at idle with a fuel pressure gauge. Low fuel pressure at idle but normal pressure at higher RPM can indicate a failing fuel pressure regulator or weak fuel pump.
How much does P2187 cost to fix on a Audi? (EUR)
Estimated repair costs for P2187 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P2187
These codes are often seen alongside P2187 or point to related issues, on any make:
Looking for the full P2187 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P2187 guideSkanyx · Audi
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