Connect TECH 2 scan tool to Data Link Connector (DLC). Turn ignition on. Obtain a FREEZE FRAME readout for DTC P0301-P0304 and record values for ENGINE RPM, AIRMASS/COMBUSTION and COOLANT TEMPERATURE. Check scan tool for any stored DTCs. If DTC P1300, P1301-P1304, P1390 or P1391-P1394 is present, go to appropriate diagnostic test procedure. If no DTCs are present, replace catalytic converter.
Home/Saab/9-3/Saab 9-3 I (1998-2003)/Repair manual/Testing & Diagnostics/DTC P0420: CATALYTIC CONVERTER MALFUNCTION
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls - Self-Diagnostics - Trionic T7 Fuel Control System: Overview
- Engine Controls - Self-Diagnostics - Trionic T7 Fuel Control System: Diagnosis
- Engine Controls - Self-Diagnostics - Trionic T7 Fuel Control System: Maintenance
- Engine Controls - Self-Diagnostics - Trionic T7 Fuel Control System: Other
- DTC P0100-P0103: NO MASS AIRFLOW (MAF) SENSOR SIGNAL
- DTC P0106: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR PERFORMANCE PROBLEM
- DTC P0107-P0108: MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR CIRCUIT
- DTC P0112-P0113: INTAKE AIR TEMPERATURE (IAT) SENSOR CIRCUIT
- DTC P0116: ENGINE COOLANT TEMPERATURE (ECT) SENSOR PERFORMANCE PROBLEM
- DTC P0117-P0118: ENGINE COOLANT TEMPERATURE (ECT) SENSOR CIRCUIT
- DTC P0125: DELAYED CLOSED LOOP OPERATION
- DTC P0131, P0132 & P0134: FRONT HEATED OXYGEN SENSOR (HO2S-1) CIRCUIT
- DTC P0133: HO2S-1 SLOW RESPONSE
- DTC P0137, P0138 & P0140: REAR HEATED OXYGEN SENSOR (HO2S-2) CIRCUIT
- DTC P0171: LONG TERM FUEL TRIM MULTIPLICATIVE FUEL MIXTURE TOO LEAN
- DTC P0172: LONG TERM FUEL TRIM MULTIPLICATIVE FUEL MIXTURE TOO RICH
- DTC P0300: RANDOM MISFIRE DETECTED
- DTC P0301-P0304: CYLINDERS 1-4 MISFIRE DETECTED
- DTC P0327: KNOCK SIGNAL INPUT
- DTC P0336 & P0337: CRANKSHAFT POSITION (CKP) SENSOR
- DTC P0340: CAMSHAFT POSITION SIGNAL
- DTC P0420: CATALYTIC CONVERTER MALFUNCTION
- DTC P0441: EVAP PURGE VALVE MALFUNCTION
- DTC P0442 & P0455: EVAP SYSTEM LEAK DETECTED
- DTC P0444-P0445: EVAP CANISTER PURGE VALVE CIRCUIT MALFUNCTION
- DTC P0452-P0453: FUEL TANK PRESSURE (FTP) SENSOR CIRCUIT
- DTC P0455: LARGE LEAK IN EVAP SYSTEM
- DTC P0501 & P0502: VEHICLE SPEED SENSOR (VSS) CIRCUIT
- DTC P0506: IDLE SPEED CONTROL (ISC) TOO LOW
- DTC P0507: IDLE SPEED CONTROL (ISC) TOO HIGH
- DTC P0605: INTERNAL ECM MALFUNCTION
- DTC P1105: CHARGE AIR ABSOLUTE PRESSURE (CAAP) SENSOR HOSE LEAK
- DTC P1106: CHARGE AIR ABSOLUTE PRESSURE (CAAP) SENSOR CIRCUIT PERFORMANCE PROBLEM
- DTC P1107-P1108: CHARGE AIR ABSOLUTE PRESSURE (CAAP) SENSOR CIRCUIT
- DTC P1110: CHARGE AIR BYPASS (CAB) VALVE PERFORMANCE MALFUNCTION
- DTC P1135-P1136: HO2S-1 HEATER CIRCUIT
- DTC P1141-P1142: HO2S-2 HEATER CIRCUIT
- DTC P1171-P1172: SHORT TERM FUEL TRIM LEAN OR RICH MIXTURE
- DTC P1181-P1182: LONG TERM FUEL TRIM-ADDITIVE LEAN OR RICH MIXTURE
- DTC P1230: THROTTLE POSITION SENSOR CIRCUITS NO. 1 & 2 VOLTAGE SUM OUT OF RANGE
- DTC P1240: THROTTLE MOTOR SHORT CIRCUIT
- DTC P1251-P1253: THROTTLE MOTOR FULL PULSE-WIDTH MODULATION MALFUNCTION
- DTC P1260: INSUFFICIENT THROTTLE RETURN SPRING FORCE
- DTC P1261: THROTTLE BINDING
- DTC P1263: THROTTLE MOVED MANUALLY WHILE ENGINE RUNNING
- DTC P1264: THROTTLE STAYS OPEN WHEN PEDAL IS RELEASED
- DTC P1300: RANDOM MISFIRE DETECTED, POTENTIAL CATALYST DAMAGE
- DTC P1301-P1304: CYLINDERS 1-4 MISFIRE DETECTED, POTENTIAL CATALYST DAMAGE
- DTC P1310: IGNITION DISCHARGE MODULE (IDM) MALFUNCTION
- DTC P1312: COMBUSTION DETECTION CYLINDERS 1 & 2 CIRCUIT FAULT
- DTC P1334: COMBUSTION DETECTION CYLINDERS 3 & 4 CIRCUIT FAULT
- DTC P1390: RANDOM MISFIRE & LOW FUEL LEVEL DETECTED - POSSIBLE CATALYST DAMAGE
- DTC P1391-P1394: CYLINDER 1-4 MISFIRE & LOW FUEL LEVEL DETECTED - POSSIBLE CATALYST DAMAGE
- DTC P1441: EVAP PURGE VALVE CIRCUIT & LOW FUEL LEVEL PROBLEMS AT SAME TIME (2000 LEV)
- DTC P1442 & P1455: EVAP PURGE VALVE CIRCUIT LEAK & FUEL LEVEL SENSOR PROBLEM DETECTED AT SAME TIME (2000 LEV)
- DTC P1444 & P1445: EVAP SHUT-OFF VALVE CIRCUIT MALFUNCTION
- DTC P1451-P1453: FUEL TANK PRESSURE (FTP) SENSOR MALFUNCTION
- DTC P1460: ALARM IMMOBILIZER ACTIVE
- DTC P1491-P1493: TANK PRESSURE SENSOR & FUEL LEVEL SENSOR PROBLEMS DETECTED AT SAME TIME (2000 LEV)
- DTC P1530-P1531: PEDAL POSITION SENSOR CIRCUITS NO. 1 & 2 VOLTAGE SUM OUT OF RANGE
- DTC P1532: PEDAL POSITION SENSORS NO. 1 & 2 SHORT IN ECM CONTROL CIRCUITS
- DTC P1549: CHARGE AIR MALFUNCTION
- DTC P1576 & P1577: BRAKE LIGHT SWITCH CIRCUIT MALFUNCTION
- DTC P1601-P1633: INTERNAL ECM MALFUNCTION (EXCEPT P1624)
- DTC P1624: TRANSMISSION CONTROL MODULE REQUEST "CHECK ENGINE" INPUT
- DTC P1640: MAIN RELAY CIRCUIT VOLTAGE LOSS AT ECM CONNECTOR TERMINAL NO. 1
- DTC P1641: NO VOLTAGE FROM FUEL PUMP RELAY TO FUEL PUMP & HO2S HEATER
- DTC P1652-P1653: MAIN RELAY COIL OPEN OR SHORT CIRCUIT
- DTC P1654-P1655: FUEL PUMP RELAY COIL CIRCUIT
- DTC P1656-P1657: A/C RELAY COIL CIRCUIT
- DTC P1658-P1659: CHARGE AIR BYPASS VALVE (CABV) CIRCUIT
- DTC P1662-P1663: CHARGE AIR CONTROL (CAC) VALVE CIRCUIT
- DTC P1670-P1671: LIMP-HOME SOLENOID RELAY COIL CIRCUIT
- DTC P1676: FUEL INJECTORS OPEN OR SHORT CIRCUIT
- DTC P1908: SERIAL BUS DATA MALFUNCTION (MIU)
- DTC P1923: SERIAL BUS DATA MALFUNCTION (TCM)
- Engine Controls - Trouble Shooting - No Codes: Diagnosis
- Engine Controls - Trouble Shooting - No Codes: Other
- Exhaust Emission Control System, Petrol: Specifications
- Exhaust Emission Control System, Petrol: Overview
- Exhaust Emission Control System, Petrol: Diagnosis
- Exhaust Emission Control System, Petrol: Other
- Abbreviations
- Accessory Drive Belts
- Adjustments
- Airbag
- Antenna Systems
- Anti-Lock/traction Control
- Application
- Automatic HVAC System
- Automatic Trans
- Auxiliary Emission Control Systems
- Axle Shafts
- Basic Engine, 4-CYLINDER Petrol
- Basic Engine, 4-CYLINDER Petrol: Removal & Installation
- Basic Trouble Shooting
- Blowers, Superchargers & Turbochargers
- Body, Cab Control Systems
- Brakes
- Cabin Air Filter
- Charging System
- Charging System - Component Location, Removal & Installation
- Check Lists
- Clutches Manual & Hydraulic
- Communication Devices
- Computer Relearn
- Cooling Fan
- Cooling System (Mechanical)
- Cooling System, Petrol
- Cruise Control Systems
- Cruise Control Systems
- Diagnostic Connector Locations
- Dice - 9-3 (9400)
- Door Locks & Anti-Theft Systems
- Drive Cycles
- Driveline/axles
- DTC Index
- Electrical Component Locations
- Emission Applications
- Engine
- Engine Control Systems
- Engine Performance
- Exhaust
- Exterior Lights
- Fuel System
- Fuel System, Petrol
- Fuses & Circuit Breakers
- Gauges & Instrument Panels
- General Servicing - All Makes
- Headlights
- Heated Glass/defoggers
- Identification
- Interior/illumination Lights
- Main Instrument Panel, Petrol - 9-3
- Main Instrument Panel, Petrol - 9-3: Diagnosis
- Manual Gearbox
- Manual HVAC System
- Manual Trans
- Mechanical
- Mechanical - Hydraulic
- Memory Modules
- Metric Conversions
- Mirrors
- Mode 6
- Oem General Information
- Removal & Installation
- Reset Procedures
- Restraints
- Saab Information Display (Sid) - 9-3 (9400)
- Seats
- Sensor Range Charts
- Specifications
- Starter
- Steering
- Steering Column
- Steering Column Switches
- Steering Gear
- Sun Roof/t-Top/convertible Top
- Suspension Front
- Suspension Rear
- Testing & Diagnostics
- Theft Protection
- Theory & Operation
- Traction Control Disable
- Transmission
- Turbocharger System, Petrol - 9-3
- Twice - 9-3 (9400)
- Warning System
- Wash/wipe Systems - 9-3 (9400)
- Wheel Alignment
- Windows
- Wiper/washer Systems
- Wiring Diagrams - Engine Performance
- Wiring System (Data Link Connectors, Pwr Dist., Grnd Dist.)