"Decreased Engine Performance" message? - Volvo Forums - Volvo Enthusiasts Forum


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Old 04-19-2017, 10:46 AM
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Default "Decreased Engine Performance" message?

Car is a 2006 V50, T5 AWD, coming up on 90,000 miles, regularly serviced and maintained.

About every 5,000 miles, for the last 25,000 or so, I get the "Decreased Engine Performance" message. It's a decrease in performance that really isn't noticeable during ordinary cruise or casual acceleration but is definitely noticeable under hard acceleration.

When I get it, I dump a pint of Techron or Ventil Sauber into a tank of gas and it seems to go away for another 5,000 miles.

Is there a more permanent fix for this condition? Some people have said removing and cleaning the MAF sensor will do it.
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Old 04-19-2017, 06:18 PM
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Need the codes read to have any idea.
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Old Yesterday, 04:54 PM
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It's not throwing a code. No check-engine light, just the "decreased engine performance" message.
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Old Yesterday, 06:11 PM
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There are codes. Maybe not ones a generic code reader can read, but they are there.

Diagnosis is free at the dealer, so that might be your best bet if you have one near by.
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