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 MANUALSVOLVO2004S80 L6-2.9L TURBO VIN 91 B6294TREPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONMANUFACTURER CODE CHARTSECM CODES (ENGINE CONTROL MODULE)ECM-2A1APERMANENT FAULT
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294T
Permanent Fault
2004 Volvo S80 L6-2.9L Turbo VIN 91 B6294TSECTION Permanent Fault
Permanent fault
Checking for air leakage in the exhaust system
Check for air leakage. See Checking for air leakage in the exhaust system Air Leakage Exhaust System, Check.
Remedy as necessary.
Was there any air leakage?
Yes - ECM-ver1
No - Replacing the component
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Replacing the component
Try a new heated oxygen sensor (HO2S).
Other information
- To access or replace the heated oxygen sensor (HO2S) for the C70, S70, V70 -2000 and V70XC, see Adapter wiring switch, replacing Adapter Wiring Switch, Replacing. For other models, see Heated oxygen sensor (HO2S), replacing Heated Oxygen Sensor (HO2S), Replacing
- To connect the breakout box / access the control module, see Connecting the breakout box, B5254T2 Connecting the Test Box
- For information about signals on 5 cylinder engines, see Signal specification Signal Specification
- For information about signals on 6 cylinder engines, see Signal specification Signal Specification.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reconnect connectors, reinstall components.
- Test drive car as follows:
A/C on
Drive the car so that idle, normal and high speeds are reached. Let the car operate in these phases for a few minutes.
Accelerate at full throttle a number of times so that high boost pressure is reached (applies only to turbo models).
Total test drive time must be 15 minutes.
Note! After test driving the engine should not be turned off. The test drive must be carried out again.
Connect VIDA again and read out the heated oxygen sensor (HO2S) diagnostic trouble code (DTC) status.
The text NOT READY is displayed if diagnosis is underway.
Is FAULT NOT REGISTERED displayed?
Yes - Verification completed
No - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit Fault-Tracing
No - Attempt New Test
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Attempt New Test - Checking for air leakage in the exhaust system
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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.