What Does P0172 Mean on Your 2024 Toyota Tacoma?
The 2024 Toyota Tacoma received a complete redesign, now powered by a 2.4L turbocharged inline-4 engine producing 228 hp (base) or 278 hp (i-FORCE MAX hybrid). This replaces the previous 3.5L V6 and 2.7L four-cylinder. P0172 means the ECM detected a rich fuel condition on Bank 1. The inline-4 turbo has one bank covering all four cylinders.
On a brand-new 2024 with a new engine platform, P0172 may indicate a calibration issue, sensor defect, or assembly-related problem that Toyota's warranty should cover.
Common Symptoms You Might Notice
- Check engine light on
- Fuel economy below the 21/26 MPG EPA rating
- Faint fuel smell from exhaust
- Slight rough idle
- Minor hesitation on acceleration
- Black residue on tailpipe
Top Causes of P0172 on the 2024 Tacoma
- ECM Software Calibration (35% likelihood): As a completely new engine and platform, the 2024 Tacoma's 2.4L turbo may benefit from software updates that refine fuel trim parameters.
- MAF Sensor Issue (25% likelihood): A factory defect or early contamination from PCV oil vapor in the turbo engine can affect MAF accuracy.
- Faulty O2 Sensor (20% likelihood): A manufacturing defect in the upstream oxygen sensor can cause incorrect fuel trim feedback.
- Turbo Boost System Leak (20% likelihood): Loose intercooler piping, hose clamps, or turbo outlet connections from assembly can allow unmetered air.
How to Diagnose P0172 on Your 2024 Tacoma
- Take it to the dealer. The 2024 Tacoma is covered by Toyota's 3-year/36,000-mile basic and 5-year/60,000-mile powertrain warranty.
- Ask about TSBs. Toyota may have issued updates for the new 2.4L turbo engine's fuel management.
- Check the air filter. Verify proper installation and condition.
- Inspect turbo intake plumbing visually. Look for any obviously loose clamps or hoses.
Repair Options and Costs
- Warranty repair: $0 at Toyota dealership
- ECM software update: $0-$150 (usually warranty-covered)
- MAF sensor cleaning: $10 DIY or $60-$110 at a shop
- MAF sensor replacement: $160-$320 parts and labor
- O2 sensor replacement: $190-$380 parts and labor
- Boost system repair: $75-$300
Can You DIY This Repair?
For a 2024 model, visit the dealer under warranty. The repair should be free. DIY work on a new vehicle can complicate warranty coverage. If outside warranty, the Tacoma has good engine bay access for basic tasks like MAF cleaning.
Prevention Tips
- Follow Toyota's maintenance schedule for the new turbo engine
- Use OEM air filters
- Avoid aftermarket intake or turbo modifications
- Keep up with dealer software updates
- If using the truck off-road, check intake connections regularly