Cars · PhD Car Expert

Principal mechanic knowledge, token-smart

Sits on every Cars layer: free chips for locations, videos, and parts kits; local compute for voltages and draw numbers; signed-in chat only when you need synthesis. Domestic US + European electronics.

0-token chips

Where to look, parts kits, videos, safety — no model call.

Local compute

Type 12.2 V or 180 mA — interpret without burning chat quota.

Live PhD chat

Auth + plan cap. Path-scoped knowledge. Short, linked answers.

Expert workspace

Ask symptoms, codes, or voltages. Chips pull kits/videos without burning tokens.

Full procedure library (sample)

Where to look · videos · parts kits — open the float expert for Q&A.

Full PhD workspace →

Domestic security / immobilizer no-start

Security light + no crank often means key handshake, low voltage, or aftermarket wiring — not always a dead starter.

Where to look

  • · Dash: theft / security / padlock lamp with key ON
  • · Ignition cylinder or push-button start module (column / dash)
  • · Battery negative post + main body grounds (fender, engine block)
Domestic owner guide

Parasitic battery drain (US trucks / crossovers)

Morning-dead batteries after new battery installs are usually sleep strategy, aftermarket, or trailer wiring — not ‘bad battery’ forever.

Where to look

  • · Battery tray + IBS/sensor on negative cable (if equipped)
  • · 7-pin trailer connector on rear bumper / hitch
  • · Under-dash aftermarket amp / remote start / hardwired dash cam

Parts kit

Clamp meter

Domestic drain guide

BMW CAS / European immobilizer no-start

After battery work, key recognition and CAS/FEM/BDC power paths dominate — coding often required; don’t shotgun starters.

Where to look

  • · Key slot / comfort access antenna (steering column / ring antenna)
  • · CAS / FEM / BDC module (platform-specific — under dash / glove / kick)
  • · Battery in trunk or under hood + ground points
European electronics guide

Ownership cost reasoning

Sticker ≠ TCO. Insurance, fuel, maintenance variance, and Euro electronics risk dominate year 2–5.

Where to look

  • · Use in-app calculator presets
  • · Compare domestic truck vs Euro luxury side-by-side
TCO calculator

Shop taking European work? Voice-guided CAS, battery registration, and gateway procedures on RealWear — offline, hands-free.

RealWear EU pack →

All curated procedures

  • Domestic security / immobilizer no-startdomestic · 3 kit groups · 3 media
  • Parasitic battery drain (US trucks / crossovers)domestic · 3 kit groups · 3 media
  • Misfire / rough run pathdomestic · 2 kit groups · 2 media
  • BMW CAS / European immobilizer no-starteuropean · 2 kit groups · 3 media
  • European battery registration / IBSeuropean · 1 kit groups · 2 media
  • VAG / European CAN gateway & U-codeseuropean · 1 kit groups · 2 media
  • Ownership cost reasoningboth · 0 kit groups · 1 media
  • Buy / sell pre-purchase red flagsboth · 1 kit groups · 2 media