I just replace the radiator in my 2000 S70. Drove it home 25 miles or so & everything was fine. Drove it the next day for a bit still fine. All at once the check engine light came on. Then when I pushed the gas pedal the car will shake & the check engine light will flash.once I get up to speed the check engine light will stay solid but car runs smooth until I push the gas pedal again. I replaced the mass air flow sensor, air filter, spark plugs, use injector cleaner & a full tank of premium gas but no change. Thanks for any help!!

 

Code?

 

Seems like an 02 sensor. Same "problem" with my car!
Just use Marvels mystery oil, its helped my car a lot.
Or find a gas/oil additive you like!

 

Doesn't sound at all like an oxygen sensor. And additives are not going to fix anything.