Felkoder Volvo 940 [work] Access

| Code | Description | Likely Cause | | :--- | :--- | :--- | | | No Faults Found | System functioning normally. | | 1-1-4 | Knock Sensor (KS) | Sensor loose, connector corroded, or faulty sensor. | | 1-2-4 | Knock Sensor Signal | Noise interference or open circuit. | | 1-4-2 | RPM Sensor | Faulty sensor located near the flywheel (Reference sensor). | | 1-4-3 | EGR System | Common on turbos; EGR valve stuck or hose cracked. | | 2-1-4 | RPM Sensor Signal | Intermittent signal to ignition ECU. | | 2-2-4 | Coolant Temperature Sensor | Signal missing or erratic. | | 2-3-4 | Throttle Position Sensor | WOT (Wide Open Throttle) contact fault. |

| Code | Description | Likely Cause | | :--- | :--- | :--- | | | No Faults Found | System functioning normally. | | 1-1-2 | ECU Internal Fault | The Fuel ECU is failing. Usually requires replacement. | | 1-1-3 | Front Oxygen Sensor (O2) | Lambda sensor faulty or wiring issue. | | 1-2-1 | Mass Air Flow (MAF) Sensor | Air mass meter signal missing or out of range. | | 1-2-3 | Engine Coolant Temp Sensor | Faulty sensor affecting cold starts/fuel mix. | | 1-3-1 | RPM Sensor Signal | No signal from the flywheel sensor (Cranks but won't start). | | 1-4-3 | Front Oxygen Sensor (Lean Mix) | Vacuum leak or O2 sensor tired. | | 2-1-3 | Throttle Position Sensor (TPS) | Idle contact fault or wiring issue. | | 2-2-3 | Idle Air Control Valve (IACV) | Sticky valve or solenoid failure (causes rough idle). | | 3-1-1 | Vehicle Speed Sensor | Speedometer signal missing (transmission sensor). | | 3-2-1 | Cold Start Injector | Faulty injector or connection. | felkoder volvo 940

Usually points to an ignition system fault, specifically with the coil or the ignition output. | Code | Description | Likely Cause |