Fault Family System: Powertrain (P-Codes) 6 SAE Codes

Intake Air Leak Restriction

Diagnostic & Technical Explanation

Code P2279 (Intake Air System Leak Bank 1) sets when the ECM's airflow model localizes a leak or restriction to a specific zone of the intake tract — between the air filter and MAF sensor, between the MAF and throttle body, or downstream of the throttle plate — by comparing MAF, MAP, and throttle data. A split or dislodged intake boot, a clamp loosened during prior service, a collapsed or clogged air filter, and a cracked intake manifold or leaking manifold gasket are the physical causes, each pointing to the zone the code names.

These 6 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 6 times.

Codes in this family (6)

Code	Definition	Repair coverage
P2279	Intake Air System Leak Bank 1	4 ranked fixes
P227F	Air Flow Restriction/Air Leak Between Air Filter and MAF Bank 2	4 ranked fixes
P2280	Air Flow Restriction/Air Leak Between Air Filter and MAF Bank 1	4 ranked fixes
P2281	Air Leak Between MAF and Throttle Body	4 ranked fixes
P2282	Air Leak Between Throttle Body and Intake Valves	4 ranked fixes
P2ADF	Intake Air System Leak Bank 2	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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