Scania EMS DTC 7971 The heater for the wide-band lambda probe, break in circuit

EMS Engine Management System · Scania

Code 7971 (decimal). Some diagnostic tools show it in hexadecimal as 001F23.

In short

The control unit indicates that the lambda sensor has a break in the circuit.

Applies to: EMS10

What does Scania EMS fault code 7971 mean?

What causes Scania DTC 7971?

How to fix Scania EMS fault code 7971?

Read the full explanation with Premium

Causes, system reaction, symptoms and step-by-step repair instructions for every fault code are available to Premium members.

  • Full explanations of every code and brand
  • Causes, symptoms and repair steps
  • New brands and codes included
Get Premium – 7,50 € / month I already have an account

Yearly plan: pay 10 months, get 12. Cancel at any time.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 7971 in other Scania systems