A Fault Code Is a Clue, Not a Decision
A P0420 is a place to begin, not a parts order.
04 / FIELD NOTESSILICON STEPS / WILLIAM DENG
A WORKING NOTEBOOK
NOTES.
Brief observations, questions and working hypotheses. Each note leaves room for the view to change.
THE FORMAT / 04
Notes keep a short record of a question while the answer is still taking shape.
01Observe
02Interpret
03Revisit
ENTRIES01