What Does P0172 Mean on Your 2023 Honda HR-V?
The 2023 Honda HR-V was completely redesigned and now features a 2.0L naturally aspirated inline-4 engine producing 158 horsepower, a significant upgrade from the previous 1.8L. P0172 means the engine control module has detected that the engine is running rich on Bank 1. Since this is an inline-4, Bank 1 covers all four cylinders.
On a vehicle this new, P0172 is uncommon and may indicate a manufacturing defect, software issue, or sensor problem that should be covered under Honda's factory warranty.
Common Symptoms You Might Notice
- Check engine light illuminated
- Fuel economy below the expected 26/32 MPG
- Light fuel smell from exhaust
- Slightly rough idle
- Occasional hesitation on acceleration
- Black residue on the tailpipe
Top Causes of P0172 on the 2023 HR-V
- MAF Sensor Defect or Contamination (30% likelihood): Even on new vehicles, the MAF sensor can have factory issues or pick up contamination from assembly residues or early PCV system operation.
- ECM Software Calibration (30% likelihood): As a redesign year with a new engine, the 2023 HR-V may benefit from an ECM software update that adjusts fuel trim calibration.
- Faulty O2 Sensor (20% likelihood): A defective upstream oxygen sensor from manufacturing can cause incorrect fuel trim adjustments.
- Intake System Issue (20% likelihood): A loose hose clamp, improperly seated air filter, or minor assembly issue in the intake tract can affect air metering.
How to Diagnose P0172 on Your 2023 HR-V
- Check warranty status. The 2023 HR-V is covered under Honda's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Visit the dealer first.
- Ask about TSBs. Technical Service Bulletins for the new 2.0L engine may address fuel trim issues.
- Verify air filter seating. Open the air box and ensure the filter is installed correctly with no gaps.
- Check fuel trims with a scanner. Negative LTFT values confirm the ECM is actively compensating for rich running.
- Visual inspection of intake connections. Check all visible hoses and clamps in the intake tract for tightness.
Repair Options and Costs
- Warranty repair: $0 at Honda dealership
- MAF sensor cleaning: $10 DIY or $50-$90 at a shop
- MAF sensor replacement: $120-$230 parts and labor
- ECM software update: $0-$150 (usually warranty-covered)
- O2 sensor replacement: $150-$320 parts and labor
- Intake system repair: $40-$150 depending on the issue
Can You DIY This Repair?
Since the 2023 HR-V is under warranty, we recommend taking it to the Honda dealer first. The repair will likely be free. If for some reason the warranty does not cover it, MAF sensor cleaning is an easy 15-minute DIY job. Checking the air filter and intake connections is also simple.
Prevention Tips
- Follow Honda's recommended maintenance schedule
- Use OEM or high-quality air filters
- Do not modify the intake system, as this can affect MAF readings
- Keep up with software updates at dealer service visits
- Use regular 87 octane fuel as recommended