Tech Tip: Volkswagen Check Engine Light Is On With Trouble Code P2187 – UnderhoodService

Tech Tip: Volkswagen Check Engine Light Is On With Trouble Code P2187

The check engine light is on, with trouble code P2187, too lean off idle bank 1. This "Fast Fix" from Identifix shows how one tech solved this issue.

Vehicle: 2004 Volkswagen Beetle GLS 2.0L, L4, MFI, SOHC

Customer Concern: The check engine light is on, with trouble code P2187, too lean off idle bank 1.

Potential Causes:
– Defective Mass Air Flow (MAF) Sensor
– Leaking Engine Vacuum
– N80 Canister Purge Solenoid

Tests:

1. Check and verify that there are no vacuum leaks or ­un-metered air leaks.

2. Check the MAF sensor grams/second readings as ­follows:

  a. Idle (about 830 rpm) 3.5 grams/sec. or more (4 to 4.5 grams/sec. preferred).

  b. 2,500 rpm no load, 9 to 15 grams/sec. (11 to 12 grams/sec. preferred).

  c. Wide open throttle road (WOT) load (drive vehicle at 45 mph in third gear and perform a WOT acceleration, observe maximum indicated grams/sec. readings on the MAF); 90 or more grams/sec. preferred.

  d. A MAF that exhibits ­consistently lower than normal grams/sec. readings can cause a P0102 code to set.

3. Check for a leaking N80 Canister Control Valve. This can cause a vacuum leak and a lean idle condition.

Confirmed Fix: Replaced the MAF sensor.

Courtesy of Identifix’s “Five Fast Fixes.”

You May Also Like

Carbon Deposits and Direct Injection Engines

The primary cause of these problems is that fuel and added detergents are not hitting the back of the intake valves.

In the late ‘90s and early 2000s, TSBs related to carbon deposits on the valves were few and far between. There are three reasons why direct-injection engines are more prone to carbon deposits. One reason is unique to direct injection, and the remaining two are problems for port fuel-injection engines that are made worse by direct injection.

Determining Catalytic Converter Efficiency

Almost every part on the engine determines how long a catalytic converter will last.

Talking To Customers About Oxygen Sensors

One of the toughest components to sell as a maintenance item, or even a replacement item, is an oxygen sensor.

PCV System DTC

PCV systems are far more complex now, but they are also much better at controlling crankcase pressure.

Do Oxygen Sensors Generate Electricity?

They are made of zirconium oxide, a chemical compound used to form the sensor’s thermal-driven electrochemical fuel cell.

Other Posts

Diesel Air Filter Replacement

Here are some diesel air filter replacement tips in order to keep these vehicles running as intended.

Auxiliary Cooling Pumps

An auxiliary cooling pump’s primary function is to circulate warm coolant to the heater core.

Battery Management Means Knowing How It Ages

The battery may be fully charged, but you also need to measure how low the voltages go while the engine is cranking.

Deciphering Engine Misfire Codes

When the fuel/air mixture ignites, many factors must be met to pass a misfire monitor.