Hi, I had pretty much the same codes on my 02 4x4, lean on both banks and a dead O2 sensor, I replaced the O2 sensor and the cleared the codes then after 1/2 mile the light came right back on, ran a scan and again same two codes. So I talked to a Ford Tech and he told me to look for a vacuum leak around the following things; intake manifold, throttle body, EGR, and all vacuum lines and if that was not it then to replace the mass airflow sensor.
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