P0402 Fault Code on 2000 Chrysler Town & Country 3.8L: EGR System Diagnosis and DPFE Sensor Inquiry
At approximately 99,000 miles, the Check Engine Light (CEL) activated and displayed fault code P0402. I replaced the EGR valve, after which the CEL turned off for a few driving cycles but reappeared about 10 days later. The code has returned again, indicating persistent issues. I've read that replacing the DPFE (Differential Pressure Feedback Emission) sensor may resolve this, but I cannot locate such a component in my official repair manuals. Does Chrysler use a different name for this part? I'm seeking guidance on what to inspect next—such as EGR vacuum lines, intake passages, or wiring connections—to address the recurring P0402 code. Any insights or troubleshooting steps would be greatly appreciated.
The 2000 Chrysler Town & Country 3.8L does not have a DPFE sensor as part of its EGR system. The entire EGR vacuum modulator and valve assembly should be replaced as a single unit. If the P040-2 code persists, potential causes include faulty wiring to the modulator connector, a missing or damaged gasket, a blocked vacuum line, or an obstruction in the intake passage. A software or PCM issue is possible but rare. I recommend checking these components systematically before considering further diagnostics. Good luck—please update with your findings.