Well NOx is there from higher exhaust temperatures. So make sure you’re cooling system is functioning cause that’s bad in itself. Make sure the EGR system is functioning. if that doesn’t fix it, the catalyst may need replacement.
You’re test is twice the max amount, so I’d bet the cat is in need of replacement.
If you want, you can try an oil change, retard the timing, and clean your EGR valve & passages.
Remember if you’re lowering NOx, the others will rise.
You’re test is twice the max amount, so I’d bet the cat is in need of replacement.
If you want, you can try an oil change, retard the timing, and clean your EGR valve & passages.
Remember if you’re lowering NOx, the others will rise.
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