The car is a 1997 Ford Taurus GL with 3.0L engine. The EGR Tube as well as the EGR Valve have been replaced after a P0402 code appeared after a head gasket replacement. Everything worked fine and about a week later the PCM is giveing the P0402 code again. I was wondering if at this point I can ignore this safely until next month when I can afford a new DPFE sensor, or just ignore it completely. I will be required to take a 240 miles round-trip drive for a job. Will this effect the car's ability to make it on this trip?