Back to 2002 Infiniti QX4

2002 INFINITI QX4

3.3L V6RWDAUTOMATICgas
6 active safety recalls on this vehicle — view recalls
Repairs0Labor498Torque3650Fluid7DTC705Battery0Maintenance0Recalls6
P1126moderate severityPowertrain

Thermostat Function

on 2002 Infiniti QX4 3.3L V6 · RWD

What this code means

Engine coolant temperature not reaching expected operating temperature.

Symptoms

  • CEL
  • Engine runs cold
  • Poor efficiency
  • Weak heater
  • Slow warm-up

Common causes

  • Thermostat stuck open
  • Faulty ECT sensor
  • Air in cooling system
  • Low coolant

Diagnostic steps

  1. Monitor coolant temp
  2. Test thermostat
  3. Check ECT sensor
  4. Inspect cooling system

Repair notes

Replace thermostat.

Other Powertrain codes on this vehicle

Building an app?
Free API access to all this data — 50 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →