Having problems with your 2000 Mazda Protege ?
Where is the O2 sensor located in a 2003 Mazda Protege 5? The schematic that I pulled shows 2 in the engine and none by the exhaust.
Should have one located in the exhaust manifold, or soon after, then one in the catalytic converter, or soon after.
Repair Help & Product Troubleshooting for 2000 Mazda Protege
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