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Discussion Starter #1 (Edited)
Has anyone had these combination of codes before? P0133 And 1402

my 98 Frontier 4x4 has a 2.4L w/ 190k miles...

I leaning towards the EGR Valve cleaning (or replacement) but don't really want to try the shotgun approach with buying parts.

Thanks
Chris


Great site BTW...
 

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Discussion Starter #3
I cleaned the EGR valve and replaced some of the vac hoses. So far so good...

Also, would an air leak or blockage cause a low idle or missing cylinders at idle?
 
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