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The majority of issues found with the 2003 B 3000 stem from regular wear and tear on parts over time. One common complaint is the failure of the mass air flow sensor, leading to rough engine performance and poor idling. Replacing this sensor at a reputable auto shop could cost around $450. Another frequently reported issue is a lack of spark, which may be caused by a faulty distributor. Some owners have also noticed engine noise, often resulting from worn parts or low oil levels. It's important to regularly check the engine oil level and ensure the crankcase is adequately filled. To do so, pull out the dipstick, wipe it clean, reinsert it, and then check the oil level at the tip of the dipstick.
The Mazda B3000 from 2003 is known to experience issues with running roughly at idle and occasionally having difficulty starting.