Free API
Help
2003 INFINITI FX45
4.5L V8•AWD•AUTOMATIC•gas
9 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor478Torque672Fluid7DTC1782Battery1Maintenance0Recalls9
C1197high severityChassis

Vacuum Sensor Circuit Malfunction

on 2003 Infiniti FX45 4.5L V8 · AWD

What this code means

The brake booster vacuum sensor circuit is open, shorted, or out of range. No direct OBD P-code equivalent.

Symptoms

  • Brake/VDC warning light on
  • Reduced brake assist
  • Hard brake pedal

Common causes

  • Faulty vacuum sensor
  • Sensor circuit open or short
  • Connector corrosion
  • Faulty ABS control unit

Diagnostic steps

  1. Scan for C1197 and read sensor voltage
  2. Inspect sensor connector and wiring
  3. Check sensor supply and ground
  4. Replace sensor if circuit fault confirmed
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Chassis codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2003 Infiniti FX45 repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Infiniti FX45 — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with Auto Shop Base — $249/mo, all features included.
Try Auto Shop Base →