Did a timing chain/phaser replacement on ny truck recently and after rebuild, check engine light came on showing one of the exhaust timings are off. I can’t remember which side, it’s been a while since I checked it. Engine runs perfectly fine no rough idle or anything so I’m assuming the sprocket is only a tooth off. I really don’t want to tear this thing down again, is it fine to drive it like that and if so, can anything be done about the check engine light?

 

Either live with the light, or fix it.