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99 Outback - P1540, P1507 & P500


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I have a 99 Legacy Outback

 

P0500 Vehicle speed sensor malfunction

P1507 Idle control system malfunction (fail-safe)

P1540 Vehicle speed sensor malfunction 2

 

The engine is idleling very rough and I got the following codes. I have found a few treads on this but I haven't found anybody that has posted their fix. If you are one of those folks that has had the exact same problem, can you let me know what fixed it.

 

For now I am going to:

Clean the airflow sensor

Check Speed Sensors

 

Thanks,

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