What Does P0172 Mean on Your 2022 Nissan Frontier?
A P0172 code on the redesigned 2022 Nissan Frontier means the engine control module has found that Bank 1 is running too rich. The 2022 Frontier was completely redesigned and uses the 3.8L VQ38DD V6 engine producing 310 horsepower and 281 lb-ft of torque, paired with a 9-speed automatic. Bank 1 is the rear bank of the V6, closest to the firewall.
A rich condition wastes fuel and can damage the catalytic converter. The 2022 Frontier may still be under powertrain warranty, so checking your coverage is a good first step.
Common Symptoms You May Notice
- Check engine light illuminated
- Worse fuel economy
- Rough or surging idle
- Black exhaust smoke
- Fuel odor from the tailpipe
- Sluggish performance
Top Causes of P0172 on the 2022 Frontier
- Contaminated MAF sensor - Truck use means more dust exposure. A dirty MAF underreports airflow and causes over-fueling.
- Failing upstream O2 sensor - The Bank 1 oxygen sensor may be degraded, providing incorrect data for fuel trim corrections.
- Leaking fuel injector - The 3.8L V6 uses direct injection. A leaking rear bank injector delivers excess fuel.
- EVAP purge valve stuck open - A malfunctioning valve sends fuel vapors into the intake continuously.
How to Diagnose the Problem
Scan codes and check freeze frame data. Look at Bank 1 STFT and LTFT. Negative LTFT beyond -10% confirms the rich condition.
Clean the MAF sensor with dedicated cleaner. Monitor the Bank 1 upstream O2 sensor. Test fuel pressure if needed.
Repair Options and Cost Estimates
- MAF sensor cleaning or replacement: Cleaning under $10. New sensor $40-$150 plus $40-$90 labor.
- O2 sensor replacement: Parts $40-$145. Labor $65-$140.
- Fuel injector replacement: Parts $30-$95 per injector. Labor $175-$375.
- EVAP purge valve: Parts $20-$50. Labor $40-$90.
Can You Fix This Yourself?
MAF cleaning is easy. O2 sensor replacement is moderate. Check warranty coverage before doing DIY work that might void coverage.
Prevention Tips
- Replace the air filter frequently in dusty conditions
- Use quality fuel
- Run fuel system cleaner periodically
- Do not ignore check engine lights