P0171 on Your 2022 Dodge Challenger
A P0171 code on your 2022 Dodge Challenger indicates the PCM detected a lean air-fuel mixture on Bank 1. The 2022 Challenger is available with the 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L HEMI V8, or the supercharged 6.2L HEMI. Regardless of engine, P0171 means there is an imbalance with too much air or too little fuel on Bank 1.
The Challenger community loves modifications, and aftermarket parts are a frequent contributor to this code. Here is how to identify and fix the root cause.
Symptoms
- Check engine light on
- Rough idle or slight engine vibration
- Hesitation during acceleration
- Reduced fuel economy
- Possible misfires at low RPM or under light load
- Less responsive throttle than normal
Common Causes
- Vacuum Leak (30% likelihood) - Cracked or loose vacuum hoses, intake manifold gasket leaks, or a failed PCV valve can introduce unmetered air. Both the Pentastar and HEMI engines have common vacuum leak patterns.
- MAF Sensor Issue (30% likelihood) - This is especially common on Challengers with aftermarket cold air intakes. Oiled filter elements contaminate the MAF sensor and cause inaccurate readings.
- Fuel Delivery Problem (25% likelihood) - A weakening fuel pump, clogged fuel filter, or dirty injectors can reduce fuel delivery below the PCM target.
- Exhaust Manifold Leak (15% likelihood) - Loose or broken exhaust manifold bolts on HEMI engines can create leaks that affect the upstream O2 sensor reading.
Diagnostic Steps
- Scan for all codes. Check for P0174, misfire codes, and O2 sensor related codes.
- Monitor fuel trims. LTFT above +10% confirms lean. Evaluate idle versus driving conditions.
- Inspect intake system. Check all vacuum connections, PCV valve, and intake manifold area.
- Smoke test. Find hidden vacuum leaks by pressurizing the intake with smoke.
- Clean or replace MAF sensor. If you have an aftermarket intake, this should be your first check.
- Test fuel pressure. Verify against factory specifications.
Repair Costs
- Vacuum leak repair: $75 - $350.
- MAF sensor service: $15 - $280.
- Fuel pump replacement: $400 - $850.
- Exhaust manifold repair: $250 - $700.
Aftermarket Modification Tips
If your Challenger has modifications, consider these points: switch to a dry filter if using an oiled one, ensure your tune accounts for any intake or exhaust changes, and verify that all vacuum connections were properly reinstalled after any engine bay work.
Prevention Tips
- Use quality dry air filter elements
- Fill up with premium fuel as recommended
- Inspect exhaust manifold bolts on HEMI engines
- Check vacuum hoses during routine maintenance
- Keep up with fuel system maintenance