Checking the computer to get an answer
Slow down warning typically is a bad coil, probably fouled sprk plg as well, read the code it will tell you which cyl, the last nuber on the code reading is the cyl.
Not familiar with volvo but had a pontiac years ago that had a shift up/down light that was only to maximize fuel economy (standard transmission)
SOURCE: Volvo S60 sensor ?
Sounds like an oxygen sensor (there are two). I had a recent problem where I had a rough idle and my S60 continued to stall out. Turned out to be the rear oxygen sensor. After replacement, car idles nicely and car drives normally.
SOURCE: check engine light flashes on /off computer says to down shift or slow down
get the codes read by VOLVO only now
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