P0174 on Your 2023 Honda Ridgeline
The P0174 code on your 2023 Honda Ridgeline means the powertrain control module has detected a lean air-fuel mixture on Bank 2 of the engine. The 2023 Ridgeline uses a 3.5-liter V6 producing 280 hp and 262 lb-ft of torque, with a 9-speed automatic and available AWD. Bank 2 on this V6 is the rear cylinder bank near the firewall, and a lean condition there means insufficient fuel relative to incoming air.
Lean running creates excess heat in the combustion chamber, which can damage pistons, valves, and catalytic converters. Since the 2023 Ridgeline may still be under warranty, starting with a dealer visit can be a smart first step.
Symptoms
- Check engine light on
- Rough idle
- Acceleration hesitation
- Reduced power
- Higher engine temperature
- Bank 2 misfires
Common Causes
- Vacuum Leak on Bank 2 - Even on newer vehicles, a loose clamp, improperly sealed gasket, or factory defect can cause a vacuum leak on the rear bank.
- MAF Sensor Issue - A dirty or defective MAF sensor underestimates airflow.
- Restricted Fuel Injector - A partially clogged injector on Bank 2 restricts fuel delivery.
- Bank 2 O2 Sensor Fault - A defective upstream O2 sensor causes incorrect fuel adjustments.
Diagnostic Steps
- Read all codes - Check for P0171 and related codes.
- Vacuum leak check - Inspect rear bank hoses and gaskets.
- Clean the MAF - Quick, cheap first step.
- Compare bank trims - Isolate issue to Bank 2.
- Test injectors - Run balance test.
Repair Costs
- Vacuum hose repair - $5 to $30, plus $80 to $160 labor.
- Intake gasket - $40 to $90, plus $260 to $460 labor.
- MAF cleaning - $10 to $25.
- MAF replacement - $90 to $205, plus $50 to $100 labor.
- Fuel injector replacement - $65 to $145 per injector, plus $220 to $410 labor.
- O2 sensor replacement - $75 to $175, plus $80 to $165 labor.
DIY Feasibility
MAF cleaning is easy. Front-side checks are straightforward. Rear bank access is challenging but possible for experienced mechanics. For a vehicle potentially under warranty, having the dealer handle the repair ensures proper coverage.
Prevention Tips
- Take advantage of warranty coverage for early diagnosis
- Use top-tier gasoline
- Follow Honda's maintenance schedule
- Keep the air filter clean
- Do not ignore check engine lights