What Does P0172 Mean on Your 2020 Dodge Durango?
A P0172 code on your 2020 Dodge Durango means the PCM has detected a rich fuel condition on Bank 1. The 2020 Durango comes with the 3.6L Pentastar V6 (293 hp) or the 5.7L HEMI V8 (360 hp). On both V-type engines, Bank 1 is the driver's side cylinder bank.
The Durango is a family hauler that also tows — and a rich condition affects both fuel economy and towing performance. Getting it diagnosed quickly is smart, especially if you rely on your Durango for daily duties and weekend adventures.
Symptoms You Might Notice
- Check engine light on
- Worse fuel economy (a big concern on a three-row SUV)
- Rough or uneven idle
- Black exhaust smoke
- Fuel smell at the tailpipe
- Reduced power under load or when towing
Common Causes of P0172 on the 2020 Dodge Durango
- Dirty MAF Sensor — The Durango's MAF sensor is susceptible to contamination, especially in dusty conditions or with aftermarket filters.
- Stuck-Open EVAP Purge Valve — A common Mopar issue. The purge solenoid sticks open, continuously feeding fuel vapors into the intake.
- Aging O2 Sensor — With potentially 50,000+ miles, the upstream oxygen sensor may be degrading.
- Leaking Fuel Injector — HEMI injectors can develop leaks, particularly on MDS-equipped engines.
How to Diagnose the Problem
- Scan all DTCs — Check for P0175 and related companion codes.
- Analyze fuel trims — Compare Bank 1 and Bank 2 LTFT.
- Test MAF sensor — Verify readings against specs.
- Test purge valve — Bidirectional control test.
- Monitor O2 sensor — Check voltage switching.
- Check fuel pressure and injectors — System pressure and balance test.
Repair Options and Cost Estimates
- MAF Sensor Cleaning — DIY: $10-$15. Shop: $60-$115.
- MAF Sensor Replacement — Parts: $75-$180, labor: $60-$115. Total: $135-$295.
- Purge Valve Replacement — Parts: $25-$60, labor: $60-$115. Total: $85-$175.
- O2 Sensor Replacement — Parts: $70-$190, labor: $90-$175. Total: $160-$365.
- Fuel Injector Replacement — Parts: $45-$145 each, labor: $200-$400. Total: $245-$545.
Can You Fix This Yourself?
MAF cleaning and purge valve replacement are easy DIY tasks on the Durango. The engine bay provides good access to these components. O2 sensors are accessible from underneath. Injector work is more involved, especially on the HEMI.
Prevention Tips
- Replace the air filter on schedule
- Use quality fuel from reputable stations
- Monitor fuel economy — sudden drops indicate issues
- Follow Dodge's maintenance schedule