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Message: <blockquote data-quote="seech" data-source="post: 420452" data-attributes="member: 4572">Hey rizal,My mech not open on sundays unless he happens to be there completing a project. No real way to determine if your ECU is failing. Just some symptoms. Costs depends as getting a hold of a spare ECU can be difficult so pricing dependent on where you can find it.Auto and manual different as the auto ECU has additional sockets for the control of the auto gearbox.One possible way to test is to try out another 1JZ and see if yours feels underpower. If not then your fuel consumption could be due to the exhaust O2 sensor. Full throttle runs revert to the pre set maps while cruising uses the O2 sensor to adjust the air/fuel ratio for best fuel economy. Can't think of any other way to test this.</blockquote>