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Discussion Starter · #1 ·
20k after replacing DPF, ecm, and reduction unit; now getting check engine light again w following codes: p2453,p20e2, p20e4
 

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Discussion Starter · #4 ·
Looks like exhaust gas sensors (2) and exhaust back pressure sensors may be at issue. Anyone know how to locate exactly where they are at?
 
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