What Does P0174 Mean on Your 2022 Honda Accord?
The P0174 diagnostic trouble code on your 2022 Honda Accord indicates a lean air-fuel mixture detected on Bank 2. The 2022 Accord offers a 1.5-liter turbocharged inline-four producing 192 hp or a 2.0-liter turbocharged inline-four making 252 hp, along with a hybrid variant. Since all engine options are inline-fours with a single bank, a P0174 code is atypical. Regardless, the lean condition is genuine and should be investigated.
A lean-running engine does not have enough fuel to match the incoming air. This causes higher combustion temperatures, can damage internal engine components, and degrades performance. Finding and fixing the root cause will protect your engine and restore proper operation.
Symptoms
- Check engine light on
- Rough or surging idle
- Hesitation on acceleration
- Reduced power output
- Engine running hotter than normal
- Possible misfires or stumbling
Common Causes
- Vacuum Leak - Cracked or disconnected vacuum hoses, intake manifold gasket leaks, or PCV system problems allow unmetered air into the engine. This is consistently the top cause of lean codes on Honda engines.
- Dirty MAF Sensor - The mass airflow sensor accumulates contamination over time. On the turbo 1.5L and 2.0L, oil mist from the crankcase ventilation system can accelerate this.
- Insufficient Fuel Delivery - A weakening fuel pump or restricted filter cannot keep up with fuel demand, especially under boost on the turbocharged models.
- Faulty O2 Sensor - An oxygen sensor providing incorrect readings causes the ECM to adjust fuel delivery in the wrong direction.
Diagnostic Steps
- Scan for codes - Read all DTCs. Check for P0171 and related codes.
- Inspect for vacuum leaks - Check all hoses, clamps, intake gaskets, and PCV components. A smoke test reveals hidden leaks effectively.
- Clean the MAF sensor - Remove and spray with dedicated MAF cleaner.
- Monitor fuel trims - STFT and LTFT above +10% confirm a lean condition.
- Test fuel pressure - Measure at idle and under load to verify adequate fuel delivery.
Repair Costs
- Vacuum hose repair - $5 to $25 for parts. Quick DIY.
- Intake manifold gasket - $30 to $75 for the gasket, plus $150 to $290 in labor.
- MAF sensor cleaning - $10 to $25.
- MAF sensor replacement - $85 to $190 for the part, plus $50 to $100 in labor.
- Fuel pump replacement - $170 to $360 for the pump, plus $200 to $380 in labor.
- O2 sensor replacement - $65 to $160 for the sensor, plus $70 to $130 in labor.
DIY Feasibility
The 2022 Accord is fairly accessible for home mechanics. Vacuum hose checks, MAF sensor cleaning, and air filter replacement are easy tasks. O2 sensor and MAF sensor replacement are doable with basic tools. Fuel system work, including pump replacement, is more involved and may be better left to a professional.
Prevention Tips
- Regularly inspect vacuum hoses for wear and cracking
- Keep the air filter clean to protect the MAF sensor
- Use top-tier fuel from reputable gas stations
- Follow Honda's maintenance schedule
- Address check engine lights promptly