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What could be causing code po171 on a 2000 Toyota Echo 1.5L to come on?

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What could be causing code po171 on a 2000 Toyota Echo 1.5L to come on?. It just happened today, never before.

Vehicle: 2000 Toyota Echo 1.5L

1 Answer

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There are several things that can cause this code, vacuum leaks, low fuel pressure and a problem with one of the o2 sensors. The individual items must be tested to determine the cause of the problem.

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