2002 Ford Focus ZX3 DOHC code P0402

Shawna’s question:

Thus far you have helped me out with my little 2002 Ford Focus ZX3 DOHC. Now the engine light is on with the code P0402. I know it has something to do with the EGR Valve or sensor or even a vacuum hose that may have come loose. Am I on the right track here? If so, where are these two items, and how do I check determine if they are bad and which one to change? Thank you, Shawna”

Answer:

That’s the code for excessive EGR flow.Either you have a hole in a hose or a loose hose, a bad EGR valve, a bad EGR solenoid, or a bad ECM (main computer.) So go to any auto parts store and they can show you where the EGR valve and its hoses are. Hopefully it’s just a hose, because you can’t check out the other stuff without a lot of knowledge and a lot of diagnostic tools. BUT, you or someone you know could try removing the EGR valve on the engine and see if it’s stuck open. Sometimes they do that and cleaning them with some carb cleaner spray can make them work normally again. Good Luck,


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