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Check engine light on on your 1999 Mazda protoge the code is p0171 reads system too lean bank 1 and code p0174 reads system too lean bank 2 how do you repair it?
Wiki User
∙ 16y ago
Sounds like the o2 sensors are working,They are telling you are getting too much air in your fuel.Try to spray starter fluid around all your vacume lines and fittings while the car is running.If the car revs up slightly you have just found your air leak and saved some money.
Wiki User
∙ 16y ago
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