I recently added a high flow cat after my flash.......after 1 full tank, about half way through the second tank The service engine soon indicator came on......I checked the gas cap and it was fine......could it be a bad batch of gas???? please help thanks Al...............

 

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It happens. Car service engine signs always go on after you start modifying
a car one way or another. Mine is on forever. I have no problems driving it.
Mine is a Galant. I have never heard of a bad batch of gas....more than
likely your car is okay. If your car starts falling apart, then that is a clear
indication something is wrong. Lots of Luck.

 

Did you put a cel fix on with the hi-flow cat? If not, that could be your problem. Just pay 6$ and get an o2 extender and you should be good to go

 

The code is....p0420.....thanx guys

 

Cat Code man get some antifoulers and call it a day

 

try to dis connect the battry for like 10 mints and get it back again and see

hope that will help or take it to any autozone they will do the test on you car and they will tell you why is it showing......its free though

 

Guy's, it's the test pipe he needs a cell fix!

 

anti-foulers, o2 extender, or if im not mistaking.... al can you delete the code in a flash? i kno you can with an obd2 reader, but that only lasts an engine start or two... and unplugging the battery will do the same thing... just reset it for an engine start up or two

 

OMG - time to rebuild the motor !

only kiding - seriously get a spark plug anti fouler and screw that in under the rear 02 sesnor - Buschur Racing sells them

Al

 

lol....thanks Al.....