P2187 on Volkswagen
System Too Lean at Idle (Bank 1)
P2187 on Volkswagen vehicles indicates system too lean at idle (bank 1). Au7o has documented this code across 2 Volkswagen models — most commonly on CC, Golf R. This code means the engine's computer has detected the air-fuel mixture on Bank 1 is too lean specifically at idle, while it stays acceptable at higher speeds. The computer monitors the oxygen sensors and has had to add significant fuel correction at idle to compensate. Because the fault appears mainly at idle, it usually points to a small vacuum or air leak that has a big effect when airflow is low. Symptoms often include rough or unstable idle, stalling, and hesitation when first taking off. Typical repair costs on Volkswagen range from $30 to $1,800, depending on the specific model and root cause.
Common Causes of P2187
- •Small vacuum leak (hose, gasket, or fitting)
- •Intake manifold or throttle body gasket leak
- •Faulty or leaking PCV valve/hose
- •Dirty or failing mass airflow (MAF) sensor
- •Leaking or dirty fuel injectors
- •Faulty upstream oxygen sensor
- •Low fuel pressure at idle
- •Leaking brake booster or its vacuum hose
P2187 on Volkswagen by Model
Volkswagen CC(1 issue)
- PCV Valve / Oil Separator Diaphragm Failure2009-2017
The EA888's PCV (the integrated crankcase oil separator / pressure-regulating valve) develops a torn rubber diaphragm or stuck check valve. A torn diaphragm passes full intake-manifold vacuum to the crankcase, creating a large vacuum leak. Symptoms include rough/high idle, lean codes, whistling or hissing, oil leaks, and increased oil consumption. Severe cases can pull the rear main crankshaft seal off its mounting plate, turning a cheap part into an expensive repair.
Volkswagen Golf R(2 issues)
- EVAP N80 Purge Valve Failure and Large/Small Leak Codes2015-2022
The EVAP system on MQB-platform Golf R (MK7/MK7.5, with some MK8 cases) frequently throws evaporative-emissions leak faults. The most common culprit is the N80 purge valve failing to seal, but the leak-detection pump, carbon (charcoal) canister breakdown, and saturated canister from overfilling the tank also trigger codes. Symptoms are a check engine light with small- or large-leak codes, occasional rough idle or hesitation just after start, and sometimes a fuel smell. Often surfaces around emissions/inspection (relevant for EU periodic technical inspection).
- EA888 PCV Valve / Oil Separator Diaphragm Failure2015-2023
The crankcase ventilation (PCV) valve, integrated into the valve cover/oil separator on the EA888 Gen3 (and carried into Gen4), commonly fails when the internal rubber diaphragm or check valve tears or sticks. This disrupts crankcase pressure regulation, causing rough idle, misfires, lean/rich fuel-trim codes, a whistling or sucking noise, and elevated oil consumption. Critically, a failed PCV can pull excessive vacuum and blow out the rear main seal, turning a cheap part failure into a labor-intensive oil leak that requires separating the transmission from the engine. Widely reported on MK7/MK7.5 Golf R (and the related GTI/S3) on VWVortex and EA888 specialist write-ups.
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View P2187 across all makes →Frequently Asked Questions
What does P2187 mean on Volkswagen?▼
P2187 stands for "System Too Lean at Idle (Bank 1)." This code means the engine's computer has detected the air-fuel mixture on Bank 1 is too lean specifically at idle, while it stays acceptable at higher speeds. The computer monitors the oxygen sensors and has had to add significant fuel correction at idle to compensate. Because the fault appears mainly at idle, it usually points to a small vacuum or air leak that has a big effect when airflow is low. Symptoms often include rough or unstable idle, stalling, and hesitation when first taking off. On Volkswagen specifically, this code is documented across 2 models.
What causes P2187 on Volkswagen vehicles?▼
Common causes on Volkswagen: Small vacuum leak (hose, gasket, or fitting), Intake manifold or throttle body gasket leak, Faulty or leaking PCV valve/hose, Dirty or failing mass airflow (MAF) sensor, Leaking or dirty fuel injectors. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2187 on a Volkswagen?▼
Repair costs on Volkswagen range from $30 to $1,800, depending on the specific model and root cause.
Which Volkswagen models have P2187 documented?▼
Au7o has documented P2187 on 2 Volkswagen models: CC, Golf R.