When the car is cold, it doesn't get information from the oxygen sensors to figure out how to mix fuel and air, it just does the mixing on default values. This is called "open loop." Then when it is warm it goes into "closed loop" by including information from the front oxygen se...

MrSalvage wrote: ↑27 Oct 2018, 10:55 Do you have any idea how much a cheap code reader would cost or could i build one?

You can buy a cheap Bluetooth obdII reader for under $5 on eBay. You can download app on your phone for it.