What Does Code P0420 Mean on a 2022 Jeep Compass?
A P0420 code on your 2022 Jeep Compass indicates the ECU has detected reduced Bank 1 catalytic converter efficiency. The 2022 Compass is powered by a 2.4L Tigershark MultiAir inline-4 engine producing 180 horsepower and 175 lb-ft of torque, paired with either a 6-speed automatic (FWD) or 9-speed automatic (4x4). This compact SUV uses a single exhaust bank configuration.
The Tigershark 2.4L engine has some known characteristics that make P0420 a relevant concern, particularly related to oil consumption in some units.
Common Symptoms
- Check engine light on (steady)
- Mild fuel economy reduction from the rated 26 city/31 highway MPG
- Possible rotten egg smell from exhaust
- Emissions test failure
- Usually no significant performance concerns
Most Likely Causes on the 2022 Compass
1. Failing Catalytic Converter
The 2.4L Tigershark engine in some Compass models can consume oil, and oil contamination is one of the fastest routes to catalytic converter degradation. Even without oil consumption, the converter can wear with mileage.
2. Faulty Downstream O2 Sensor
The rear oxygen sensor can become sluggish or fail. The Compass's lower exhaust routing exposes the sensor to road spray and debris that can accelerate deterioration.
3. Exhaust Leak
The exhaust manifold gasket and catalytic converter flange connections can develop leaks over time, especially with the 9-speed automatic's vibration patterns.
4. Oil Consumption Contaminating Catalyst
The 2.4L Tigershark MultiAir engine has a documented history of oil consumption in some production runs. Oil vapor passing through the combustion process gradually poisons the catalyst substrate.
How to Diagnose the P0420 Code
- Scan for all stored and pending codes — check for oil-related or misfire codes
- Check for Stellantis TSBs for the 2022 Compass
- Monitor live data from upstream and downstream O2 sensors
- Document oil consumption rate between changes
- Inspect exhaust system for leaks
Repair Options and Costs
Professional Repair
- Catalytic converter replacement: $700–$1,300 parts and labor
- O2 sensor replacement: $140–$270
- Exhaust leak repair: $100–$300
- PCM software update: $80–$180
DIY Considerations
O2 sensor replacement is manageable on the Compass. The vehicle's compact size makes exhaust access tighter than larger Jeeps but still feasible with a jack and stands. Check emissions warranty before paying out of pocket.
Cost Breakdown Summary
- OEM catalytic converter: $350–$800
- Aftermarket converter: $150–$400
- O2 sensor (part): $50–$140
- Labor: $200–$500
- Diagnostic fee: $80–$130
Prevention Tips
- Monitor oil consumption closely on the 2.4L Tigershark engine
- Use the recommended 0W-20 synthetic oil and change every 8,000 miles
- Replace spark plugs at the recommended interval to prevent misfires
- Address any engine roughness or misfires immediately
- Use quality fuel to maintain clean combustion