![]() ![]() The ECU monitors the fuel pressure with the help of the fuel pressure sensor. A check engine light is also the most common sign of all bad fuel pump relay symptoms. If the ECU suspects a wrong value from any sensor, it will light up the check engine light. The engine control module does always monitors all engine sensors to ensure they do not show the wrong values. Here is a more detailed list of the signs of a bad or failing fuel pump relay to look for: 1. The relay can fail due to many reasons, from dust to electrical power surges, anything can affect the well-being of a fuel pump relay. The main symptoms of a bad fuel pump relay include: ![]()
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