Originally Posted by GOTMH8N
Does the JB4 check for codes even if there is no CEL, since a failing water pump releases hidden codes before it fails?
the JB4 itself does not check for codes,
it will not auto clear important codes like the water pump only 'annoying' codes such as O2 sensor due to catless downpipes, misfire, lean conditions
Garage Queen: 2005 Audi S4 4.2L V8, Vortech Supercharger, Vented CF Hood, PSS9 Coilovers, Sway-bars, RS4 brakes, Fast Intentions - Cat-less Downpipes & Cat-back Exhaust, 550hp
Daily Driver: E92 335i: JB4 G5 ISO27.5 w/BMS Flash, quaife LSD, BMS Meth, AA sport IC, BMS Charge Pipe, BMS OCC, Euro Light Switch, M-Sport Kit, LEDs everywhere. 12.1@117mph