P00B2

What it means

Radiator coolant sensor reading implausible compared to engine coolant or expected behavior. The engine coolant temperature sensor feeds warm-up enrichment, fan control and closed-loop entry — a stuck-cold reading keeps the engine in open loop and rich forever.

Is it safe to drive?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.

Most likely causes

• Thermostat stuck open

  high

  One of the most commonly reported causes for this code — check this first.

• Sensor element aged beyond calibration window

  low

  Less common, but worth ruling out after the more likely causes.

• Sensor mounting loose - signal damping

  low

  Less common, but worth ruling out after the more likely causes.

Related help

• Full P00B2 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?