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Amedee, Mazda Technician
Category: Mazda
Satisfied Customers: 26266
Experience:  ASE Technician advanced level specialist. Wisconsin certified emissions state inspector
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My Mazda 2002 LX 2.0 Protégé idles rough, and check engine

Customer Question

My Mazda 2002 LX 2.0 Protégé idles rough, and check engine light is on. What could the problem be?
Submitted: 12 months ago.
Category: Mazda
Expert:  Amedee replied 12 months ago.

Hello and welcome! My name isCustomerand I would like to assist you with your question. There are several possible causes that can cause the engine to run rough and check engine light to come on. First, the secondary ignition components. When was the last time the engine was tuned up? It might just need a basic tune up. Another possible cause would be plugged, restricted or leaking fuel injector or possibly fuel pressure regulator. Also, air or vacuum leaks around the intake manifold, throttle body or air/vacuum hoses or lines. Last but not least, a faulty mass air flow sensor can also cause these issues as well.. and is very common on these vehicles.