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.
1993 Saab 900 CommemorativeFACTORY OEM SERVICE PROCEDURE
Trouble Code Definitions (All Except 9000 Series Turbo)
DIAGNOSTIC CODE - LH MFI
| Permanent Fault | Intermittent Fault | Malfunction Indicated | ||
|---|---|---|---|---|
| 42241 | 22241 | Voltage Higher Than 16 Volts | ||
| 42251 | 22251 | Less Than One Volt At ECM Pin No. 4 | ||
| 42252 | 22252 | Signal Voltage Less Than 10 Volts | ||
| 42291 | 22291 | Battery Voltage Less Than 10 Volts Or Higher Than 16 Volts | ||
| 42440 | 22440 | Rich Mixture: No Control By O2 Sensor | ||
| 42441 | 22441 | Rich Idle Mixture | ||
| 42442 | 22442 | Rich Mixture | ||
| 42450 | 24250 | Lean Mixture: No Control By O2 Sensor | ||
| 42451 | 22451 | Lean Idle Mixture | ||
| 42452 | 22452 | Lean Mixture | ||
| 42460 (1) | 22460 (1) | O2 Sensor Signal Faulty | ||
| 42491 | 22491 | Incorrect Idle Mixture | ||
| 42492 | 22492 | Incorrect Mixture | ||
| 44221 | 24221 | Vehicle Speed Sensor Signal Absent | ||
| 44261 | 24621 | Vehicle Speed Sensor Signal Faulty | ||
| 44360 | 24360 | Crankshaft Sensor Signal Faulty | ||
| 44460 (1) | 24460 | Load Signal Faulty | ||
| 44461 | 24461 | ECM Programming Fault: Outside Limits | ||
| 44660 | 24660 | Pre-Ignition Fault | ||
| 44661 | 24661 | Knock Sensor Signal Faulty | ||
| 44671 | 24671 | Pre-Ig. Signal Longer Than 20 Seconds | ||
| 44662 | 24462 | Pre-Ign. Synchronization Signal Faulty | ||
| 45260 | 25260 | Throttle Potentiometer Signal Faulty | ||
| 45360 | 25360 | Brake Signal Faulty | ||
| 45641 (1) | 25641 (1) | Mass Airflow Meter Signal High | ||
| 45651 (1) | 25651 (1) | Mass Airflow Meter Signal Low | ||
| 45691 (1) | 25691 (1) | Mass Airflow Meter Signal Faulty | ||
| 45723 | 25723 | Transmission Range Signal/Function Faulty | ||
| 45771 (1) | 25771 | Throttle Position Sensor Signal Shorted | ||
| 45772 (1) | 25772 | TP Sensor Signal Indicates Idle And Full Throttle Simultaneously | ||
| 46221 (1) | 26221 | Temperature Sensor Circuit Open | ||
| 46261 | 26261 | Temperature Sensor Signal Indicates Constant Temperature | ||
| 46271 | 26271 | Temperature Sensor Circuit Shorted | ||
| 46391 | 26391 | EGR System Function Faulty | ||
| 58121 | 38121 | MAF Meter Burn-Off Function Absent | ||
| 58321 | 38321 | AIC Valve Function Faulty | ||
| 58322 (1) | 38322 | Canister Purge Valve Function Faulty | ||
| 58371 (1) | 38371 | Injector Faulty | ||
| 58372 (1) | 38372 | Canister Purge Valve Ckt Open Or Shorted To Ground | ||
| 53882 (1) | 38382 | Canister Purge Valve CKt Shorted To Battery Voltage | ||
| 60000 | - | Internal Monitoring | ||
| 60001 | - | ECM Fault | ||
| 60002 | - | ECM Fault | ||
| 67192 (1) | - | ECM Fault | ||
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Factory Service Tools
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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.