FRAME AS-LOWER 4686089 - Caterpillar

Table 1
Event Code
Code and Description Conditions which Generate this Code System Response
E172(1) High Air Filter Restriction The inlet air restriction is above the trip point pressure for the delay time. The code is logged.
E172(2) High Air Filter Restriction The engine is derated. The code is logged. Probable Causes
Inlet Air Restriction
The air filter element is plugged.
Restriction in the air inlet system
Turbocharger issueRecommended Actions
The Air Filter Element is Plugged
Check the air intake system for plugged air filters or for damaged air filters. If the engine is equipped with an air filter indicator, check the status of the indicator. If necessary, replace the air filter element.Restriction in the Air Inlet System
Check the air inlet system for restrictions. Refer to Systems Operation/Testing and Adjusting for procedures on inspecting the air inlet system.Turbocharger Issues
Check the turbocharger for proper operation. Refer to Systems Operation/Testing and Adjusting, Turbocharger - Inspect for more information.