Connect TECH 2 scan tool to Data Link Connector (DLC). Turn ignition on. Obtain a FREEZE FRAME readout for DTC P0301-P0306 and record values for ENGINE RPM, AIRMASS/COMBUSTION and COOLANT TEMPERATURE. Check scan tool for any stored DTCs. If DTC P1300, P1301-P1306, P1390 or P1391-P1396 is present, go to appropriate diagnostic test procedure. If none are present, replace catalytic converter.
Home/Saab/9-5/Saab 9-5 I (1997-2001)/Repair manual/Testing & Diagnostics/DTC P0420: CATALYTIC CONVERTER MALFUNCTION
Contents
Wiring diagrams Section: Testing & Diagnostics- Engine Controls - Self-Diagnostics: Overview
- Engine Controls - Self-Diagnostics: Diagnosis
- Engine Controls - Self-Diagnostics: Maintenance
- Engine Controls - Self-Diagnostics: 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) CIRCUIT
- DTC P0133: HO2S-1 SLOW RESPONSE
- DTC P0137, P0138 & P0140: FAULTY REAR HO2S
- 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-P0306: CYLINDERS 1-6 MISFIRE DETECTED
- DTC P0327: KNOCK SIGNAL INPUT
- DTC P0332: KNOCK SIGNAL INPUT
- DTC P0336 & P0337: CRANKSHAFT POSITION (CKP) SENSOR
- DTC P0340: CAMSHAFT POSITION SIGNAL
- DTC P0410: SECONDARY AIR INJECTION (SAI) AIRFLOW MALFUNCTION (2000 V6 LEV MODELS)
- 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 CONTROL MODULE MALFUNCTION
- DTC P1105: CHARGE AIR ABSOLUTE PRESSURE (CAAP) SENSOR HOSE LEAK (4-CYLINDER)
- 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 (4-CYLINDER)
- 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-P1306: CYLINDER 1-6 MISFIRE DETECTED, POTENTIAL CATALYST DAMAGE
- DTC P1310 & P1320: IGNITION DISCHARGE MODULE (IDM) MALFUNCTION
- DTC P1312: COMBUSTION DETECTION CYLINDERS 1 & 2 CIRCUIT FAULT (4-CYLINDER)
- DTC P1313: COMBUSTION DETECTION BANK 1 CIRCUIT FAULT (V6)
- DTC P1320: IGNITION DISCHARGE MODULE (IDM) MALFUNCTION - (V6) FRONT CYLINDER BANK
- DTC P1324: COMBUSTION DETECTION BANK 2 CIRCUIT FAULT (V6)
- DTC P1334: COMBUSTION DETECTION CYLINDERS 3 & 4 CIRCUIT FAULT (4-CYLINDER)
- DTC P1390: RANDOM MISFIRE & LOW FUEL LEVEL DETECTED - POSSIBLE CATALYST DAMAGE (4-CYLINDER)
- DTC P1390: RANDOM MISFIRE & LOW FUEL LEVEL DETECTED - POSSIBLE CATALYST DAMAGE (V6)
- DTC P1391-P1396: CYLINDERS 1-6 MISFIRE & LOW FUEL LEVEL DETECTED - POSSIBLE CATALYST DAMAGE
- DTC P1413 & P1414: SECONDARY AIR INJECTION PUMP RELAY CIRCUIT FAULTY (2000 V6 LEV MODELS)
- DTC P1441: EVAP PURGE VALVE CIRCUIT & LOW FUEL LEVEL PROBLEMS AT SAME TIME (LEV)
- DTC P1442 & P1455: EVAP PURGE VALVE CIRCUIT LEAK & FUEL LEVEL SENSOR PROBLEM DETECTED AT SAME TIME (LEV)
- DTC P1444 & P1445: EVAP SHUT-OFF VALVE CIRCUIT MALFUNCTION
- DTC P1451-P1453: FUEL TANK PRESSURE (FTP) SENSOR MALFUNCTION
- DTC P1455: EVAP PURGE VALVE CIRCUIT LARGE LEAK & FUEL LEVEL SENSOR PROBLEM DETECTED AT SAME TIME (LEV)
- DTC P1460: ALARM IMMOBILIZER ACTIVE
- DTC P1491-P1493: TANK PRESSURE SENSOR & FUEL LEVEL SENSOR PROBLEMS DETECTED AT SAME TIME (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 (4-CYLINDER)
- 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 (4-CYLINDER)
- DTC P1662-P1663: CHARGE AIR CONTROL (CAC) VALVE CIRCUIT (4-CYLINDER)
- 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)
- DTC P1925: NO BUS COMMUNICATION WITH TORQUE CONTROL/ANTI-LOCK BRAKE SYSTEM (TC/ABS)
- Engine Controls - Trouble Shooting - No Codes: Diagnosis
- Engine Controls - Trouble Shooting - No Codes: Other
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