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DTC codes / Volkswagen codes / P1142

P1142 · VolkswagenLoad Calculation Cross Check Lower Limit Exceeded

P1142 on Volkswagen vehicles means the engine control module (ECM) has detected that the calculated engine load is lower than the expected minimum threshold during its cross-check of sensor inputs. The ECM compares the load signal derived from the mass air flow (MAF) sensor against the load calculated from the manifold absolute pressure (MAP) sensor and throttle position, and when the MAF-based load falls below the lower limit, this code is stored.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Slight hesitation or stumble during light acceleration
  • Reduced engine power or sluggish response when climbing hills
  • Occasional rough idle or fluctuating idle speed
  • Poor fuel economy in some cases
  • In rare instances, the engine may enter limp mode

Common causes, most likely first

  1. Contaminated or failing mass air flow (MAF) sensor
  2. Vacuum leak in the intake tract after the MAF sensor
  3. Dirty or faulty manifold absolute pressure (MAP) sensor
  4. Restricted air intake or clogged air filter
  5. Wiring or connector issues at the MAF or MAP sensor
  6. Leaking or stuck open purge valve or other unmetered air entry
  7. Engine control module (ECM) software issue or internal fault (less common)

How to diagnose and fix it

  1. Inspect the air intake system for leaks, loose clamps, or disconnected hoses and repair as needed
  2. Clean the MAF sensor with dedicated MAF cleaner and verify its output with a scan tool
  3. Check the MAP sensor reading against expected values and clean or replace if faulty
  4. Perform a smoke test to locate vacuum leaks that are not visible
  5. Verify wiring and connectors at the MAF and MAP sensors for corrosion or damage
  6. Compare live data for MAF, MAP, and throttle position to ensure they correlate correctly
  7. If all sensors and wiring check out, have the ECM software updated or inspected by a dealer

What the load cross-check really monitors

  • A dirty MAF sensor often causes this code without setting a MAF-specific fault, so cleaning it first can save unnecessary part swaps.
  • Small vacuum leaks that are invisible to the eye can trigger P1142, so a smoke test is more reliable than a visual inspection alone.
  • The code can be set by a failing MAP sensor even when the MAF sensor is working perfectly, because the ECM cross-checks both signals.
  • On some Volkswagen models, a software update for the ECM is required to correct overly sensitive load monitoring thresholds.
  • P1142 can appear after a poorly performed air filter replacement if the intake hose is not seated properly, creating an unmetered air path.

Can I keep driving with P1142?

You can usually continue driving to a workshop, but avoid heavy acceleration and sustained high-speed driving until the fault is diagnosed, as the engine may enter limp mode or suffer reduced performance.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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