Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Jeep Wrangler SE, AutomaticFACTORY OEM SERVICE PROCEDURE
Emissions Control System
- Emissions Control
- Description
- Description - Emission Control System
- Description - State Display Test Mode
- Description - Circuit Actuation Test Mode
- Description - Diagnostic Trouble Codes
- Bulb Check
- Obtaining DTC'S Using DRB Scan Tool
- Description - Task Manager
- Description - Monitored Systems
- Oxygen Sensor (O2S) Monitor
- Oxygen Sensor Heater Monitor
- Leak Detection Pump Monitor (If Equipped)
- Misfire Monitor
- Fuel System Monitor
- Catalyst Monitor
- Description - Trip Definition
- Description - Component Monitors
- Description - Non-Monitored Circuits
- Fuel Pressure
- Secondary Ignition Circuit
- Cylinder Compression
- Exhaust System
- Fuel Injector Mechanical Malfunctions
- Excessive Oil Consumption
- Throttle Body Airflow
- Vacuum Assist
- Pcm System Ground
- Pcm Connector Engagement
- Description - High And Low Limits
- Description - Load Value
- Operation - Task Manager
- Description
- Evaporative Emissions
- CCV System
- PCV Valve
- EVAP/Purge Solenoid
- Fuel Filler Cap
- Leak Detection Pump
- ORVR
- Vacuum Lines
- Vapor Canister
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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