kevin4747
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Wish I could help, but my knowledge is limited to just owning a few Lexuses over the years, and there are numerous problems that can lead to poor mileage. A mechanic's diagnosis should identify the issue, unless, like you suspect, the ECU/ECM has gone bad and is not giving the correct messages. Good luck, and keep posting fresh messages with more info to try and get some advice from people ...
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hey Kevin,you helped me out before so your batting 1000.my fuel mileage has dropped 7-8 miles per gallon,mechanic said the computer thinks the car is running lean so its pumping more fuel.car runs great no check engine light however the cruise control also kicks into hi and then back shifts back down continuosly,could this be my computer?
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was reading your post on your sc400 overheating at times, I currently work for toyota and have discounts on parts/service work, maybe even ecm reflashes.. with all consideration that the state tax may be more/less.. to make it short, certified toy/lex auto tech, wholesale discounts for parts and poss. warranty/service repairs. lmk if you need Lexus info/diag and i will email it or give u a log on