P2279 means the ECU sees more air in the cylinders than the MAF measured, so unmetered air is entering downstream of the sensor and pushing fuel trims positive.
DTC/P2279·Toyota
P2279 on Toyota: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Toyota
P2279 on a Toyota means the ECU sees more air in the cylinders than the MAF measured, so unmetered air is entering downstream of the sensor and pushing fuel trims positive.
Repair cost on Toyota€45 - €675
What does P2279 mean on a Toyota?
Toyota Camry 2.4L 2AZ-FE
2002-2009The 2AZ-FE is generally leak-tight, but the ribbed intake air connector between MAF and throttle body hardens and splits along the convolutions past 200,000 km.
What causes P2279 on a Toyota?
Beyond the generic causes listed on the main P2279 page, these are the Toyota-specific patterns we see most often:
Toyota Camry 2.4L 2AZ-FECracked intake air connector (Toyota part 17881-28110)
Toyota Camry 2.4L 2AZ-FEFailed PCV valve at the rear of the valve cover
Toyota Camry 2.4L 2AZ-FELeaking throttle body gasket after a recent cleaning service
How to diagnose P2279 on a Toyota with OBD2
Follow these steps to pinpoint the root cause of P2279:
- Scan for all stored codes. P2279 usually shows up with P0171 and/or P0174, which confirm the lean condition.
- Read live fuel trims at idle and at 2500 rpm. Strongly positive STFT at idle that normalizes at higher rpm points to a small vacuum leak.
- Visually inspect the intake boot, flexing it and checking the underside where cracks often hide, plus the clamps at the MAF and throttle body.
- Pull the oil filler cap at idle. If idle changes sharply or the cap sucks down hard, the PCV system needs attention.
- Smoke test the intake tract with an EVAP smoke machine at 0.5 psi. Escaping smoke pinpoints the leak in minutes.
- With the engine idling, spray carb cleaner or feed propane around suspect joints. An rpm change confirms leak location.
- Inspect intake manifold seams, vacuum ports, and the brake booster hose for cracks, especially on plastic manifolds past 150,000 km.
- Clear the code, drive a full warm-up cycle, and recheck fuel trims to confirm the repair took.
How much does P2279 cost to fix on a Toyota? (EUR)
Estimated repair costs on a Toyota (Toyota parts and labour typically run 10% below the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P2279 on Toyota
These codes commonly cluster with P2279 on Toyota vehicles:
FAQ: P2279 on Toyota
Can I tape up a cracked intake boot to get home?
Self-fusing silicone tape will hold for a day or two, but the crack keeps propagating with every vacuum pulse. A replacement boot is €25 to €90 and usually a 20 minute job with a screwdriver.
Why does my car idle rough but drive perfectly fine on the motorway?
Manifold vacuum is highest at idle when total airflow is lowest, so a pinhole leak makes up a big percentage of the air the engine sees. At cruise the same leak is a rounding error and closed-loop trims mask it.
Will P2279 damage anything if I keep driving?
The engine won't self-destruct, but sustained lean running raises combustion temps and cooks the catalytic converter over weeks. A new cat is €400 to €1500, so spending €50 on a hose is the smart play.
Can a dirty MAF sensor cause P2279 on its own?
No. P2279 specifically flags air the MAF never saw. A contaminated MAF typically sets P0101 or generic lean codes. Clean it with dedicated MAF spray if it looks oily, but don't stop looking after that.
Does a loose oil cap actually trigger P2279?
On many engines, yes. The oil cap seals the PCV circuit. If it's missing, cross-threaded, or the rubber seal is flat, you pull unmetered air straight into the crankcase and into the intake.
Looking for the full P2279 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P2279 guideSkanyx · Toyota
Diagnosing P2279 on your Toyota?
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