Cause
Split or disconnected intake boot
The flexible ducting between airflow sensor and throttle, split or pulled off. Air entering here is never measured, so the engine runs lean while the module insists it is delivering the right fuel for the air it knows about — and the split is often on the underside, closed at rest and open under engine movement.
Typically an easy fix. Often worth checking before paying anyone to look.
Some of these codes mean you should stop driving
1 of the 11 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (11)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0068 Manifold Absolute Pressure/Mass Air Flow — Throttle Position Correlation Likely for this code Stop driving High
- P0101 Mass or Volume Air Flow Sensor A Circuit Range/Performance Likely for this code High
- P0171 System Too Lean — Bank 1 Likely for this code High
- P0174 System Too Lean — Bank 2 Likely for this code High
- P0507 Idle Air Control System RPM Higher Than Expected Likely for this code Moderate
- P2074 Manifold Absolute Pressure/Mass Air Flow — Throttle Position Correlation at Higher Load Likely for this code Moderate
- P0100 Mass or Volume Air Flow Sensor A Circuit High
- P0505 Idle Air Control System Moderate
- P2375 Turbocharger/Supercharger Inlet Pressure Sensor B Circuit Range/Performance Moderate
- P2C90 Crankcase Ventilation System - Hose A Disconnected Moderate
- P2C91 Crankcase Ventilation System - Hose B Disconnected Moderate
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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