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rpmdiag, Tech and Instructor
Category: Volvo
Satisfied Customers: 7875
Experience:  Since 1975
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My 2004 s40 has a check engine light and slow acceleration

Customer Question

my 2004 s40 has a check engine light and slow acceleration and at times I think it is going to cut off
JA: Does the light stay on solid or does it flicker? Any noticeable performance problems lately?
Customer: it flickers and the car is sluggish
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: no. I just want an idea of what is wrong, I also have an oil leak from the oil cap and engine by blow 140,000 miles. new car needed?
JA: Anything else you think the mechanic should know?
Customer: no
Submitted: 1 year ago.
Category: Volvo
Expert:  rpmdiag replied 1 year ago.

Hi, I’m Ron and I’ll be helping you today.
Before we get started though, Please understand that I don't know
your skill level or tools you have to assist us. Also understand that
I can't see, smell, hear, or touch the vehicle either, so patience is
appreciated. JA is a great Q/A site, but it does NOT replace a
repair shop.
My goal is to make you happy and get a great rating in return for
my time. Sometimes I have to give you bad news that I know you
didn’t want to hear, so please don’t shoot the messenger.

What you need to do is get the codes read by either a code reader for free at your local parts store without data OR use a scan tool to see the codes and direction on where to go next. You're experiencing a misfire when that light flashes like that, but we need to know why and what it is that's causing it.

Thanks, Ron