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Discussion Starter · #1 ·
My 97' LC (~170K) had a sudden gas mileage drop (from 15mpg to 9mpg) since 3 tanks ago. No other problem observed. I do smell the odd at the exaust, but it has been like that for last 1.5 years. Spark plus has not been replaced for at least 30K miles. New air filter, up-to-date oil change, and 0.5 psi higher than required. Anyone can help with some suggestion I can look into? Thanks.
(I towed a 6'by12' Uhaul carrier, running 2300 miles 3 months ago w/o any problem.)
 

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Discussion Starter · #2 ·
update: I changed spark plugs, no improvement; and just changed PCV valve, if it does not help, what is next thing should I check? Oxgen sensor?
 

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Need For Speed
2011 Camry SE
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10,765 Posts
Check 02 Sensor....and your catalytic converter.
 
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