Owner's book · not a shop
Know the car. Then the window. Factory specs in plain English — don't authorize until you can say this at the counter.
Fix Finder · 19 aisle tickets
Counter ticket · 19 jobs in the aisle
Identify a car on the home bay for YMM
P0420 · Shop
Catalyst efficiency — diagnose first
Do not throw the converter
Open aisle
Cabin · DIY
Cabin air filter
Glove-box clip job
Pads · Either
Brake pads
Millimeters, not adjectives
12V · Either
12-volt battery
Group size, not 'a car battery'
P0300 · Shop
Random / multiple misfire
Not a coil four-pack
Oil · Either
Oil and filter
Viscosity first
Type P0420 or cabin filter. We do not throw parts from a letter.