Fuel and air

P0068 — MAP/MAF and Throttle Position Correlation Fault

Severity: medium Drive with care, to a shop

What P0068 means

The ECU compares the airflow reported by the MAF sensor and the manifold pressure from the MAP sensor against what it expects for the current throttle angle. When these readings don't agree, it sets P0068. The code points to conflicting air measurements, not directly to one failed part.

Symptoms

  • Check Engine light on
  • Rough idle
  • Weak acceleration
  • Worse fuel economy
  • Hesitation when pressing the pedal
  • Engine may stall
  • Lean codes such as P0171

Possible causes

  1. Faulty or dirty MAF sensor
  2. Faulty MAP sensor
  3. Faulty throttle position sensor (TPS)
  4. Air leak after the MAF sensor (intake boot, manifold gasket, vacuum hoses)
  5. Damaged wiring or poor connector contact
  6. Dirty or sticking throttle plate

How to diagnose

  1. Read all codes and freeze frame data, noting any P0171 or other sensor codes
  2. Inspect the intake duct between the MAF and throttle body and the vacuum hoses for cracks and loose clamps
  3. Check the MAP, MAF and throttle connectors and wiring for corrosion, opens and shorts to ground
  4. Compare live MAF, MAP and throttle angle readings at key-on engine-off and at idle against expected values
  5. Review fuel trims (STFT/LTFT): a strongly positive value suggests an air leak
  6. Inspect the throttle plate for carbon buildup and smooth movement
  7. Verify sensor power and ground, and substitute a known good sensor if needed

Common fixes

  • Repair the air leak by replacing the boot, hose or gasket
  • Clean the MAF sensor with MAF cleaner or replace it
  • Replace the MAP sensor if confirmed faulty
  • Replace or repair the throttle position sensor or throttle body
  • Clean the throttle body and intake tract
  • Repair damaged wiring and connectors, then clear the code and road test

P0068 on different brands

Ford · manuals
On Ford, P0068:00 is listed in the 2024-2025 gasoline OBD monitor strategy as MAP/MAF to throttle position correlation; it names the monitor condition, not a confirmed failed component.

Questions and answers

Can I drive with a P0068 code?

Briefly and carefully, enough to reach a shop. The engine may lose power or stall, so don't put off the repair.

What most often causes P0068?

Most often an air leak after the MAF, a dirty or failing MAF or MAP sensor, or wiring problems. Start by inspecting the intake and connectors.

Will clearing the code fix it?

Only temporarily. If the cause remains, the ECU will detect the mismatch again and the light will return.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.