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2003 codes 420 430 171 171 - Cars & Trucks

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Fix 171 first. Look for vacuum leaks From the MAF to anywhere on the intake plenum. Vacuum leaks can be under the plenum also, depending on year make and model. After that go for the O2 sensors. Scanner is helpful on these. After that replace the catalytic converter/s.

Posted on Mar 28, 2015

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  • Kerry holsomback Mar 28, 2015

    Thank you Randy Ohlet. What's the best way to find a vacuum leak???

  • Kerry holsomback Mar 28, 2015

    Thank you Randy Ohler. What's the best way to find a vacuum leak???

  • Randy Ohler Mar 28, 2015

    Year make and model please. Some leaks you can hear, sounds like hissing. Engine size also.

  • Kerry holsomback Mar 31, 2015

    Hey Randy 2003 ford mustand 4.6

  • Kerry holsomback Mar 31, 2015

    Hey Randy 2003 ford mustand 4.6 also no cal converter

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  • 420 Answers

If you have an inferred temperature sensor, check the exhaust system temperature before and after each catalytic converter, the temp after should be considerably hotter, the cooler it is after the less efficient it is

Posted on Mar 28, 2015

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