P2179Fuel & Air Metering
System Too Rich Off Idle - Bank 2
P2179 means the ECM detected the air-fuel mixture running too rich (too much fuel) off idle on bank 2, beyond the range it can correct with fuel trim.
🚗 Yes, usually, but fuel economy and emissions suffer. Diagnose soon.
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🎯 Top Causes, Ranked by Likelihood
#1Leaking or dirty fuel injectors$100-$500
Injectors dumping extra fuel drive the mixture rich.
#2High fuel pressure or bad regulator$100-$400
Excess fuel pressure over-fuels the engine.
#3Faulty MAF or MAP sensor$100-$400
An overreading airflow sensor causes too much fuel to be added.
#4Faulty oxygen sensor or coolant temp sensor$50-$400
Bad feedback sensors skew fuel calculations rich.
🩺 Common Symptoms
- Poor fuel economy
- Check engine light
- Black smoke from exhaust
- Rough running
- Fuel smell
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.
🔧 How to Diagnose P2179
1Read fuel trims and check for a rich condition on bank 2
2Inspect fuel pressure and the regulator
3Check the MAF or MAP sensor readings
4Inspect injectors and oxygen sensor data
❓ Frequently Asked Questions
Can I drive with a P2179 code?
Usually yes for a short time, but a rich mixture wastes fuel and can foul the catalytic converter.
How much does it cost to fix P2179?
Depending on the cause, repairs run $150-$700 at a shop.
What causes P2179?
Usually leaking injectors, high fuel pressure, or a faulty airflow sensor overfueling bank 2.
🔗 Related Codes
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