The HEST (High Exhaust System Temperature) dash light will illuminate when exhaust temperatures reach 1450º F., indicating that an active regeneration is underway and exhaust system temperatures are elevated above normal levels. These temperature levels may occur for up to 40 minutes. The HEST light will remain on until the exhaust temperature.. You may also see the High Exhaust System Temperature (HEST) light, which simply means what the name indicates. The light should go out when regeneration is complete. The Stop Engine light is your last chance. If you don't perform the required regeneration as needed, your DPF will become clogged, which will damage your engine.
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The HEST (High Exhaust System Temperature) dash light will illuminate when exhaust temperatures reach 1450º F., indicating that an active regeneration is underway and exhaust system temperatures are elevated above normal levels. These temperature levels may occur for up to 40 minutes. The HEST light will remain on until the exhaust temperature.. The HEST light should come on during this process but it will shut off once the process is done. What Happens If You do Not do The Parked Regen. You get one last warning before you could cause damage to your engine. There is a third warning light that says stop engine that will come on. If you ignore it you will clog your DPF and cause the.
