What causes LIMP mode on a 1995 850 Volvo?

LIMP mode in a 1995 Volvo 850 is typically triggered by the engine control unit (ECU) detecting a fault in the vehicle's systems, particularly related to the transmission or engine performance. Common causes include issues with the throttle position sensor, mass airflow sensor, or Transmission Fluid levels. Additionally, problems with the ignition system or vacuum leaks can also lead to LIMP mode activation. The purpose of LIMP mode is to protect the engine and transmission from potential damage by limiting performance until the issue is resolved.