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code is 1405,withnew code egrlocked

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Code 1405,purchased new EGR code EGR locked closed. Reinstall original code 1405 again.
Vehicle: 2000 Isuzu trooper LS 3.5 engine

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The passage for the EGR has to be clear, a plugged EGR passage will set the code, clear the passage of te EGR.

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Any advice on p1405 code on a 2000 ford f150 5.4 liter
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