Volvo Repair: 1999 volvo s70 se emission system light, high octane fuel, transmission coolers

Question
Hi,

My Emission System Service light's on after the following sequences of events.

I was filling a marine gas can with high-octane fuel (which contained 2 cycle oil), and immediately topped up my 98 S70s tank with the 94octane.  I accidentally let the marine mix hit the nozzle before topping up the car.
I'm not sure if enough 50/1 drops of 2 cycle oil could cause this, or is it simply the high octane that's not needed that's tripping this sensor.  There is no change in performance.  Should I wait to see if the light resets after I refill with 87octane?  Or can I reset by removing the fuse?  Oh yes, on other variable is that I just starting towing a boat and the car has only 80000 km..

Thank you,

Pat


Answer
Hello Pat,  I dare say your 'emission light' would come onto to after a couple of spashes of 'texas pete'.No serious problems should come of it,however,it will take 4/6 wks to 'self-reset'the system.This due to what are called 'drive cycles',numerous starts and short / long trips stop and go traffic.Also,as a precaution,you need to have the codes checked,at those miles the o2 sensor may be a casualty.There are two,front and rear.Thany you and good hunting!  PKD   ps.Don't overlook oil and transmission coolers when towing!