Cadillac Seville / Cadillac Eldorado Forum Discussion, P 0300 code - 2001 Seville in Past Cadillac Vehicle Discussion; wrong.... p0300 is a random misfire or misfires it cannot be pinned because the crank pos sensors have not identified ...
Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
MD Eastern Shore - Kent Island
Re: P 0300 code - 2001 Seville
Sorry, dude, but the OP had a flashing SES (misfire detected) in the 2001 Northstar car, took it to AZ and their scanner came up with "Misfire - Cylinder 8".
SOME earlier models will readout the misfiring cylinder - the 2000 - 2004 DTC program in the FWD cars will not: You need an external scanner to pick up the 4th digit in the misfire code............ which is why Post #2 advised the OP to get an external scan.
FWIW, in this series of cars a steady SES is an emissions fault; flashing is misfire.