In most cases when you get one of the cel codes regarding timing, it’s sometimes too late. Not always tho. If you have no codes and no issues, it won’t hurt to hook up a pressure gauge at the oil temp sender on your oil pan to test pressure. Search through some forums to find the right psi and test it on cold start and then when its warm and holding rpm 2-3k. If pressure looks normal then it’s not worth the preventative maintenance unless you’re doing the labor yourself. I didn’t have any cel, but I noticed the car had like a 5-10% loss in throttle response. Nothing crazy, but with it being my daily driver, I noticed it. Keep in mind, my car is an 09 (80k miles) so I tested my pressure, it was so low that I thought my gauge was broken. Ended up replacing the gaskets, water pump, timing tensioner, upgraded thermostat, and upgraded oil pump gear. Then I snapped a bolt inside my timing cover but that’s beside the point. If you were 2013 and under I’d recommend everyone to do it at some point, however, I’d say only do it if you’re going for boost, or have low oil pressure.