I have recently bought a 2004 Honda Jazz which has only done 28000 miles. It has a full Honda Service History. It is going in for a service and wondered if I should replace the spark plugs ( eight of them). I have no idea if these are the original plugs and on checking, have found that there are differing views from every 25000 miles or every 2 years. Can someone please give the correct answer.
Regards.
Ian.

 

I would go by whatever your owner's manual recommends. They didn't start selling Fits in the US until 2007 or 8 so I'm not familiar with what '04s recommend. The current generation spark plugs last over 100K miles (160K KM). Whatever the interval, it should be distance based, not time. Maybe someone with a Euro Jazz will chime in...

 

You also may want to post this on the 1st gen section maybe something under engines, I'm sure one will chime in there.

As stated before it should be based off of mileage and not time, unless you have your car running a lot at idle for long period of time for example say you were delivering pizzas or something.