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check engine light stays on on 2002 Pontiac Montana

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I bought this van used from a relative that took excellent care of it.check engine light stays on,codes shown o2sensor or possible catalytic converter which was replaced a little over a yr ago and we replaced the o2sensor and light went off but was showing not ready on catalyst,evap, and egr system and ofcourse after it was driven quite a while took it to try inspection again but light came back on whats the problem is there recalls on any items that can cause the ck engine lt to stay on? trouble code came up p1134.
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