Just like anything else mechanical, a fuel pressure regulator switch can fail. If this happens, many other problems can occur. If the regulator itself fails or malfunctions, you will have even bigger worries. The biggest factor to look out for is additional fuel making its way into the engine. If you have a problem with your fuel regulator, you may notice thick black smoke coming from the tailpipe, experience cold start stalling or notice your usual mileage dropping. These are just some of the signs to look out for if you suspect something may be wrong with your fuel pressure regulator switch or the regulator itself.
To get to the fuel pressure regulator switch, you need to find the fuel pressure regulator. To do this, you will trace the fuel rail around the engine. The metal article that is attached to the fuel rail is what you are looking for