Reliabota

How's your PCV valve and breather hose? PCV not blocked causing crankcase pressure to essentially be forced out of a seal / gasket? VERY common 1MZ problem and a simple replacement (less than $25 for the revised valve and less than 10 mins work) and check of things stopped a small oil leak and greatly reduced the oil in the intake issue I was having resulting in a decent amount of blue smoke after sitting for a few hours.

Stumbled across the same issue with my '04 Avalon and an 'el cheapo eBay ELM327 clone ( $10ish ). Appears to have initial comms error as it operates on a slower BAUD rate on these pre-'05 / '06 cars. Interestingly ELMScan Toyota (available as a free demo on Android Play Store) seemed to not take issue at all and worked seamlessly, even does freeze-frame data for any DTC's thrown.