What Does P0172 Mean on Your 2023 Honda Pilot?
The 2023 Honda Pilot received a complete redesign with the 4th generation, now powered by a 3.5L V6 engine producing 285 horsepower paired with a 10-speed automatic transmission. P0172 means the engine control module has detected a rich fuel condition on Bank 1, which is the rear cylinder bank on Honda's V6 engine. Too much fuel is being delivered relative to the amount of air entering the engine.
Since the 2023 Pilot is relatively new, this code may be covered under Honda's factory warranty. It is worth checking your coverage before spending money on diagnosis.
Common Symptoms You Might Notice
- Check engine light illuminated on the dash
- Fuel economy worse than the 19/27 MPG rating
- Faint fuel smell from the exhaust
- Slightly rough idle, especially on cold starts
- Occasional hesitation during acceleration
- Black residue on exhaust tips
Top Causes of P0172 on the 2023 Pilot
- MAF Sensor Contamination (30% likelihood): Even on newer vehicles, the MAF sensor can pick up contamination. The V6 draws significant airflow, and any oil mist from the PCV system can coat the sensor element.
- ECM Software Calibration (25% likelihood): As a redesign year, the 2023 Pilot may have ECM software updates available that improve fuel trim accuracy.
- Upstream O2 Sensor Defect (25% likelihood): A factory defect in the Bank 1 oxygen sensor can cause incorrect readings that lead to over-fueling.
- Intake Air Leak (20% likelihood): Assembly-related issues like a loose intake coupler, improperly torqued manifold bolt, or dislodged vacuum hose can affect air metering.
How to Diagnose P0172 on Your 2023 Pilot
- Check warranty coverage. The 2023 Pilot is covered under Honda's 3-year/36,000-mile bumper-to-bumper and 5-year/60,000-mile powertrain warranty.
- Ask about TSBs. Contact your dealer and ask if any Technical Service Bulletins apply to P0172 on the 2023 Pilot.
- Inspect the air filter and intake. Verify the filter is correctly seated and check visible intake connections for tightness.
- Monitor fuel trims. If you have a scan tool, check Bank 1 LTFT values. Heavily negative values confirm the ECM is trying to compensate for rich running.
- Compare Bank 1 and Bank 2 data. This helps determine if the issue is bank-specific or affects the whole engine.
Repair Options and Costs
- Warranty repair: $0 at the dealership if covered
- MAF sensor cleaning: $10 DIY or $75-$120 at a shop
- MAF sensor replacement: $160-$300 parts and labor
- ECM software update: $0-$150 (often covered under warranty)
- O2 sensor replacement: $200-$400 parts and labor
- Intake air leak repair: $50-$250 depending on the source
Can You DIY This Repair?
For a 2023 model under warranty, take it to the dealer first. DIY repairs on a vehicle this new could potentially affect your warranty coverage if complications arise. If the warranty does not cover the repair, MAF sensor cleaning and air filter checks are easy to do at home. Leave sensor replacements and ECM work to the dealership.
Prevention Tips
- Follow Honda's maintenance schedule exactly
- Use OEM air filters or high-quality equivalents
- Avoid aftermarket cold air intake systems that could affect MAF readings
- Keep up with dealer software updates
- Use 87 octane or higher fuel as recommended