Does the 2012 Honda CR-V have a timing belt or chain?

The 2012 Honda CR-V does have a timing chain. Your air filter needs to be changed every 15,000 to 30,000 miles or so. The coolant needs to be changed every 60,000 miles. The spark plugs need to be replaced every 100,000 miles unless it's a copper one. A cooper spark plug needs to be replaced every 30,000 miles. You will come across many issues with an engine. You can have oil leaks and those need to be repaired quickly. A gasket may be loose and that needs to be tightened up quickly. A spark plug may pop off, causing engine issues. There could be excessive oil use, requiring the oil to be changed sooner than expected. A really serious problem is the engine overheating. This may lead to fires and the car exploding.