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Discussion Starter #1 (Edited)
Hello from Maryland,near metro DC . My RAV4 is driving me crazy.
Only 137,000 miles. Recently, check engine light clears itself and then gets a code(s) on its own. Latest codes P0174 (system too lean bank 2) and P1150 (Air/Fuel Sensor Circuit Bank 2 Sensor 1). Two weeks ago, it reverted to no codes and I passed Maryland emissions. Two days ago these codes came up. I've already replaced PCV hose, and air fuel sensor upstream passenger side. At first these seemed to clear the problem. Is there such a thing as an air/vacuum leak that comes and goes?

Car runs ok. When CEL is on, mileage sometimes lousy (19 mpg).
 

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Passenger side is bank 1. Bank 2 should be the nearest to transmission.
 

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Hey I messaged you also but was wondering if you had any progress on this. Girlfriends Rav is having the same stuff going on.
 
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