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FORD PROBE 2.0 4CYL FLUNKED THE EMISSIONS HIGH NO2 WHAT IS THE CAUSE

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I HAVE A FORD PROBE, 2.0, 4CYL I FLUNKED MY E TEST. MY NO2 IS 1419.0 WHAT IS THE CAUSE OF THIS.  Please help me.

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Hi there

Most of the time when you have a high NOX reading it's due to the egr valve not working properly. Many times the valve is fine, but the tube for the valve is blocked.

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