Buick Regal air intake solenoid valve is broken. Replace it or a pair?

Generally speaking, which one is broken will be replaced. But if you want to avoid the same situation, you can change a pair, because both of them are at the same time, and one of them has been broken for a long time. The suggestion is to change a pair, it's up to you. If it doesn't bother you, wait until it breaks down next time. Such as chassis boom, steering gear, ball head, spark plug and so on. Bad ones can be exchanged, but some are not sold separately, and some will be exchanged for another one soon. Summary: The damage of the air intake solenoid valve has a great influence on the normal use of the vehicle, so daily maintenance may maintain the good performance and service life of all parts of the vehicle, while maintaining good use habits.