What Does P0172 Mean on Your 2022 Dodge Hornet?
A P0172 code on your 2022 Dodge Hornet means the engine control module has detected a rich fuel condition on Bank 1. The Hornet is powered by the GME 2.0L turbocharged four-cylinder engine producing 268 hp. Since this is an inline-4, Bank 1 is the only bank — the entire engine is running rich.
The Hornet is Dodge's compact crossover entry, sharing its platform with the Alfa Romeo Tonale. The 2.0L turbo is a responsive engine that relies on precise fuel metering for optimal performance and efficiency.
Symptoms You Might Notice
- Check engine light on
- Reduced fuel economy
- Rough idle
- Fuel smell from the exhaust
- Black soot on the exhaust tip
- Slightly sluggish turbo response
Common Causes of P0172 on the 2022 Dodge Hornet
- Dirty MAF Sensor — Contamination on the MAF sensor element causes inaccurate airflow readings, leading the ECU to over-fuel.
- Turbo Boost Leak — The 2.0L turbo system's intercooler piping and connections can develop leaks, causing an air-fuel mismatch.
- EVAP Purge Valve Issue — A stuck-open purge valve allows excess fuel vapors into the intake manifold.
- Faulty O2 Sensor — A defective upstream oxygen sensor provides incorrect exhaust readings.
How to Diagnose the Problem
- Scan all DTCs — Look for MAF, boost, O2, or EVAP companion codes.
- Check fuel trim data — Negative LTFT confirms the rich condition.
- Test MAF sensor — Compare readings to Stellantis specs for the 2.0L turbo.
- Inspect turbo piping — Visual check and smoke test for boost leaks.
- Test purge valve — Command open/close test with a scan tool.
- Monitor O2 sensor — Check voltage switching and response speed.
Repair Options and Cost Estimates
- MAF Sensor Cleaning — DIY: $10-$15. Shop: $55-$110.
- MAF Sensor Replacement — Parts: $85-$190, labor: $55-$110. Total: $140-$300.
- Boost Pipe/Coupler Repair — Parts: $45-$180, labor: $90-$200. Total: $135-$380.
- Purge Valve Replacement — Parts: $25-$65, labor: $55-$110. Total: $80-$175.
- O2 Sensor Replacement — Parts: $90-$200, labor: $80-$160. Total: $170-$360.
Can You Fix This Yourself?
MAF sensor cleaning is straightforward. Checking boost pipe connections for looseness is also easy. The Hornet's engine bay is reasonably accessible. Purge valve replacement is simple. O2 sensor work requires getting under the vehicle. For more complex issues, consider a shop familiar with the Stellantis platform.
Prevention Tips
- Use quality dry air filters — avoid oiled aftermarket types
- Check turbo piping connections periodically
- Use Top Tier gasoline
- Follow the manufacturer's maintenance schedule