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I have a 2001 g20t that's been throwing two codes p1148 and p0130 recently replaced the front o2 sensor and still after a mile itll kick on what causes these code really has me stumped
 

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that is the front O2. Your car is not going into closed loop. Betting it's not running 100% and your mpgs suck.

Check the fuse for the O2 and if that checks out inspect wiring. Confirm you have the correct 02 sensors as well and of course your battery is showing more then 11v at idle.
 
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