Diagnostic procedures for an illuminated check engine light with codes P0138 and P0139 on a 2001 Mercury Villager 3.3L. The rear O2 sensor and all engine tun…
Diagnostic procedures for an illuminated check engine light with codes P0138 and P0139 on a 2001 Mercury Villager 3.3L. The rear O2 sensor and all engine tun…
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