If you live in a county that does emissions testing, they test your gas cap for pressure holding yearly. So if you have a gas cap that is bleeding off so much pressure it's causing a CEL, it should be caught within a year's time during an inspection. If you live in a safety only county and no emissions, perhaps you drive through a county that does do emissions. If so, Im sure if you stopped in they wouldnt mind popping your gas cap onto the tester and hitting the button to see if it's holding pressure or not real quick.
I know gas caps are cheap but just wanted to mention another idea in case someone passes by one of these inspection locations and also happens to have this code and has yet to replace the gas cap. Shot in the dark I guess lol.
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2000 Dodge Ram 1500 Single Cab, 5.9 Auto, 4.10's, Auburn LSD, Edelbrock headers, 2.5" true duals with crossover, MSD Superconductors, APS Plenum Kit, Level10 Trans kit, Trans-Go shift kit, 2-4 BellTech Drop, SS/T rims, Toyo Proxes ST 285-60-17's, Sir Michaels Roll Pan and tailgate handle relocator, Keystone bumper cover with light openings, PIAA fogs, painted grille shell, painted Street Scene Speed Grille Inserts, SCT XCAL-2, Alpine head unit, Infinity Components front, Infinity Coaxials back, Infinity 500W 4 channel amp, Infinity Basslink, new dash, steering wheel, and guage bezel.
1996 Dodge Ram 1500 Club Cab, 5.9 Auto, 4.10's, Detroit Locker, Race Truck Trends Nascar Bumper, Painted SS/T Stripes, Alpine HU, Alpine Sound Field Processor, MTX Thunderform. 5.9L bored .030 over, Sealed Power coated pistons, balanced and polished crank, Comp 210 Cam, MP Timing Chain tensioner, Melling HV oil pump, 1.92 oversized valves and mild porting, Pacesetter Longtube Headers, FMS 24lb Injectors, Level10 Transmission kit, Trans-Go shift kit, 5 gear OD Planetary. Way more to come.