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- '02 Mazda Protege5
Now that I'm finally caught up on repairs I'm looking to do some preventative, proactive maintenance on my P5 as winter is closing in and I will only have this one car so it needs to stay reliable. I'm looking for some cheap, quick and easy things to change out so that I won't have to worry about again. For example, the little PCV valve on top of the valve cover is an important part but it's like $12 to replace and it takes 5 minutes, and I can rule out that as a possible cause for future issues. what are some other valves and sensors that notoriously fail but are easy fixes ?