One problem related to engine knocking noise has been reported for the 2003 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota Sienna based on all problems reported for the 2003 Sienna.
We own a 2003 Toyota Sienna that we bought new in January 2003. During March 2005, noticed knocking sound coming from engine during cold startups. Took to Toyota and after 4 days of various remedies which didn't work (catalytic converter replacement, oil change, engine cleaning), they chalked it up to a "known problem" with "piston slap" and said it can't be fixed, that "they all do it", and returned van to us.
| Engine And Engine Cooling problems | |
| Engine Knocking Noise problems | |
| Radiator problems | |
| Catalytic Convertor problems | |
| Engine Exhaust System problems |