P0174 on Your 2022 Honda Odyssey
The P0174 code on your 2022 Honda Odyssey tells you the engine control module has detected a lean air-fuel mixture on Bank 2. The 2022 Odyssey is equipped with a 3.5-liter V6 engine producing 280 hp, paired with a 10-speed automatic. Bank 2 on this V6 is the rear cylinder bank nearest the firewall. A lean condition on this bank means those cylinders are getting too much air or insufficient fuel.
Running lean creates higher combustion temperatures, which can damage pistons, valves, and the catalytic converter over time. Identifying and fixing the root cause is important.
Symptoms
- Check engine light on
- Rough idle or vibration
- Hesitation during acceleration
- Power loss
- Higher engine temperature
- Misfires on rear bank cylinders
Top Causes
- Vacuum Leak on Bank 2 - Cracked hoses, intake runner gaskets, or PCV connections on the rear side of the V6 allow unmetered air to enter those cylinders.
- Contaminated MAF Sensor - A dirty MAF underreports total airflow, but if only Bank 2 is lean, a vacuum leak or bank-specific issue is more likely.
- Partially Clogged Injector - Carbon deposits restrict fuel flow through one or more Bank 2 injectors.
- Faulty Bank 2 O2 Sensor - A sluggish or inaccurate sensor causes incorrect fuel trim adjustments on that bank.
Diagnostic Steps
- Pull all codes - Check for P0171 and related codes.
- Vacuum leak check - Focus on rear bank hoses and gaskets. Smoke test recommended.
- Clean the MAF - Quick, cheap first step.
- Compare bank trims - Isolate the issue to Bank 2 by comparing STFT/LTFT between banks.
- Injector balance test - Identify any restricted injectors.
Repair Costs
- Vacuum hose repair - $5 to $25, plus $80 to $150 labor.
- Intake manifold gasket - $40 to $85, plus $250 to $440 labor.
- MAF cleaning - $10 to $25.
- MAF replacement - $90 to $200, plus $50 to $100 labor.
- Fuel injector replacement - $60 to $135 per injector, plus $210 to $390 labor.
- O2 sensor replacement - $70 to $165, plus $80 to $155 labor.
DIY Feasibility
MAF work is easy. Front-side vacuum checks are straightforward. Rear bank work is challenging on the Odyssey due to the engine sitting far back in the bay. O2 sensor replacement is doable with patience. Rear bank injector and gasket work is best left to a professional.
Prevention Tips
- Inspect vacuum hoses during routine maintenance
- Use quality fuel and air filters
- Consider fuel system cleaning every 30,000 miles
- Follow Honda's service schedule
- Address check engine lights without delay