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Discussion Starter #1
2007 Rav4 Sport V6 130,000 miles.

The CEL will come on (along with VSC and 4WD lights) when I start the car (cold engine). The code is P0171. If I do nothing the lights go out on their own after 7 starts from the start when the lights came on (about a day Later). This happens about every other week or so.

The car runs fine and there is no sign of poor fuel mileage.

Any ideas? Where should I start to look?
 

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This story continues...

The lights were off for about a week. Yesterday the lights came on again (no surprise). I read the codes:

P0171
P0174
*New* P1587 - Brake System Failure

I can't find any real information on P1578.

About six months ago I replaced the brake vacuum booster. I was having trouble with a hard pedal and I could hear a vacuum hissing under the dash. The hard pedal went away but I still hear the hissing sound. Is that normal for a Rav4?

Anyone have any ideas on P1578? If the brake booster was defective it would definitely cause a vacuum leak.
 
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