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<p>[QUOTE=&quot;ntorres041788, post: 12237851, member: 339585&quot;]I have a Peterbilt with a px-9 engine which is what im assuming just the same as a L9 cummins with&nbsp; code</p><p>spn 3521 fmi 18. im sure it is pointing out to be an issue with the def system. i have tested the def with a refractometer and it shows it is fine and did do a change in the def filter as well. has anybody else have an issue similar that can be of some help. i cleared the code but noticed it has returned..[/QUOTE]</p><p><br /></p>

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