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.
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HOMESERVICE MANUALSVOLVO1998S70 GL L5-2.4L VIN 55 B5254SREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSEFI / DTC CODES (ENGINE CONTROL SYSTEM)DTC EFI-143TROUBLE CODE CONDITIONS
1998 Volvo S70 GL L5-2.4L VIN 55 B5254S
Trouble Code Conditions
1998 Volvo S70 GL L5-2.4L VIN 55 B5254SSECTION Trouble Code Conditions
1-4-3 FRONT KNOCK SENSOR SIGNAL
Trouble Code Conditions
- If engine temperature exceeds +40°C, engine speed exceeds 2,500 rpm, load exceeds 3.0 ms and the signal from the knock sensor (KS) is missing for 4 seconds the diagnostic trouble code (DTC) for that knock sensor is posted.
Substitute value(s)
- Knock control is disabled.
- Ignition advance reduced for safety reasons.
Possible source(s)
- Short-circuit to ground in signal cable.
- Open-circuit in signal or ground cable.
- Contact resistance in terminals.
- Defective knock sensor.
Fault symptom(s)
- Poor performance due to retarded ignition.
Other DTCs and Status Messages
Status message
- Select one of the following options to continue:
Alternative 1:
- Refer to: Faulty Signal. Permanent Fault.
Alternative 2:
- Refer to: Faulty Signal. Intermittent Fault.
Trouble Code Conditions
- If engine temperature exceeds +40°C, engine speed exceeds 2,500 rpm, load exceeds 3.0 ms and the signal from the knock sensor (KS) is missing for 4 seconds the diagnostic trouble code (DTC) for that knock sensor is posted.
Substitute value(s)
- Knock control is disabled.
- Ignition advance reduced for safety reasons.
Possible source(s)
- Short-circuit to ground in signal cable.
- Open-circuit in signal or ground cable.
- Contact resistance in terminals.
- Defective knock sensor.
Fault symptom(s)
- Poor performance due to retarded ignition.
Other DTCs and Status Messages
Status message
- Select one of the following options to continue:
Alternative 1:
- Refer to: Faulty Signal. Permanent Fault.
Alternative 2:
- Refer to: Faulty Signal. Intermittent Fault.
RENDER: 1.0x
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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.