What Does P0172 Mean on Your 2022 Toyota Tundra?
The 2022 Toyota Tundra was completely redesigned with a new 3.5L twin-turbo V6 engine producing 389 hp, or 437 hp in the i-FORCE MAX hybrid variant. This replaces the previous V8 engines. P0172 means the ECM detected a rich condition on Bank 1. On the twin-turbo V6, Bank 1 is one of the two cylinder banks.
The new twin-turbo V6 has different fuel management characteristics than the previous V8s. Turbo-specific components add potential causes for rich conditions that were not present on the old naturally aspirated engines.
Common Symptoms You Might Notice
- Check engine light on
- Fuel economy below the 20/24 MPG rating
- Fuel smell from exhaust
- Black soot on tailpipe
- Rough idle
- Reduced throttle response or turbo lag
Top Causes of P0172 on the 2022 Tundra
- MAF Sensor Contamination (30% likelihood): The twin-turbo system routes PCV vapors that can contaminate the MAF sensor. Tundras used in dusty conditions are especially susceptible.
- ECM Software Calibration (25% likelihood): As a new engine platform, Toyota may have issued fuel trim calibration updates for the 2022 Tundra's twin-turbo V6.
- Bank 1 O2 Sensor Issue (25% likelihood): The upstream O2 sensor on Bank 1 may have a factory defect or early degradation from turbo exhaust heat.
- Turbo Boost Leak (20% likelihood): The twin-turbo system has more plumbing than a naturally aspirated engine. A loose intercooler connection, cracked charge pipe, or boost controller issue can affect fuel delivery.
How to Diagnose P0172 on Your 2022 Tundra
- Check warranty coverage. The 2022 Tundra is covered by Toyota's 3-year/36,000-mile basic and 5-year/60,000-mile powertrain warranty.
- Check for P0175. Both codes mean both banks are rich. P0172 alone is Bank 1-specific.
- Ask about TSBs. Toyota may have bulletins for the new twin-turbo V6's fuel management.
- Clean the MAF sensor if outside warranty. Remove and spray with MAF cleaner.
- Inspect turbo charge piping. Check all intercooler and turbo connections for tightness.
Repair Options and Costs
- Warranty repair: $0 at Toyota dealership
- MAF sensor cleaning: $10 DIY or $60-$110 at a shop
- MAF sensor replacement: $170-$340 parts and labor
- ECM software update: $0-$150
- O2 sensor replacement: $200-$420 parts and labor
- Boost system repair: $100-$400 depending on component
Can You DIY This Repair?
The 2022 Tundra under warranty should go to the dealer first. If outside warranty, the new engine bay is well laid out. MAF cleaning is accessible. However, the twin-turbo system adds complexity. Boost leak diagnosis typically requires a smoke machine. Leave turbo-related repairs to a professional familiar with the new platform.
Prevention Tips
- Follow Toyota's new maintenance schedule for the twin-turbo engine
- Replace air filters more frequently in dusty conditions
- Clean the MAF sensor every 25,000-30,000 miles
- Use quality fuel, especially when towing
- Keep up with dealer software updates