Question about 2001 Toyota Camry

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2001 Toyota Camry code P0504.

The vehicle idles and runs rough and the check engine light flashes and also stays lit while driving. The code P0504 is supposedly associated to a possible faulty brake switch. Would a faulty brake switch cause these problems? What do you suggest?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: 04 Sequoia; check engine, VSC TRAC, & VSC Off all lit

replace the O2 sensor for cylinder bank #2, that is the sensor before the catalytic converter, bank 2 is the back across from the bank that # 1 cylinder is in, disconnect the battery for 5 minutes and see if that clears the problem. see photo of engine banks
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Posted on Apr 07, 2009

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SOURCE: 2001 Camry code po440,po441,po446 after engine

2001 camry code po440,po441,po446
what kind of problem and how can be solved
sam

Posted on Jun 30, 2009

  • 1861 Answers

SOURCE: 2003 Toyota Camry - Both Brake lights not working

Lok in the trunk on the left side, behind the carpet for a small plastic box with a bunch of wires going to it. Look to see if there is brake light powe coming in with the pedal depressed. If so, and no power is coming out, you need to order and replace the "taillamp failure sensor".

Posted on Jul 16, 2009

  • 3 Answers

SOURCE: '95 Toy 4-Runner Check Engine light and runs rough at idle

Older post...but, just in case you haven't found anything this is a great article.
http://www.off-road.com/toyota/tech/codes/index.html

Posted on Sep 14, 2009

  • 484 Answers

SOURCE: 1989 Toyota Camry. No brake lights.

It could be the relay, which is a yellow box located under the carpeting in the trunk on the left side. It is a problem common to your model. Also, check the brake switch's (behind the brake pedal) functionality (12V present with key at ACC or ON and continuity between wires when button engaged).

i hope this helps
-matthew

Posted on Oct 26, 2009

Testimonial: "Wow! I would have never found the problem without you guys. It was the relay located in the trunk. Thanks!"

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