Sensor de temperatura de la EGR defectuoso

The sensor measuring the temperature of recirculated exhaust gas, which the module uses to confirm that recirculation is actually happening. It is a flow check performed with a thermometer — gas flowing through the cooler and into the intake carries heat with it, so a temperature rise is the evidence that the valve did what it was told.

A faulty sensor therefore breaks the verification rather than the function. Recirculation may be working perfectly while the module concludes it is not, and it will store flow and performance codes accordingly. A flow code alongside a valve that demonstrably moves is worth pointing at this sensor before the valve or the passages are disturbed.

It sits in soot, which is what fails it. A coated element responds slowly rather than incorrectly, so correlation checks against a second sensor trip while each reading looks reasonable on its own. Watch how quickly it responds when recirculation is commanded, not what it reads at rest — a sluggish sensor is the finding, and a reading taken at one moment will not show it.