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  #1  
Old 10-13-2013, 02:22 PM
ss0320 ss0320 is offline
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Default P1521, 1128 and 1129

3 codes. Not sure if the 2 bank codes have anything thing to do with the incorrect velocity oil code. Any help would be appreciated. unsure where to start.
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Old 10-13-2013, 07:37 PM
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GTyankee GTyankee is offline
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Default

P1521-INCORRECT ENGINE OIL TYPE
you are suppose to be using 5w-20 weight motor oil
10w-30 does not let the MDS work properly & it will sometimes throw the code

i took this off of other sites
P1128-CLOSED LOOP FUELING NOT ACHIEVED - BANK 1
P1129-CLOSED LOOP FUELING NOT ACHIEVED - BANK 2

Possible causes

- Fuel delivery system
- Manifold Absolute Pressure (MAP) sensor or wiring connectors
- O2 sensor wiring or connectors
- Engine mechanical system
- Faulty Powertrain Control Module (PCM)

The Powertrain Control Module (PCM) detects a condition where the vehicle has remained in open loop fuel control, from a start-up condition, longer than a calibrated amount of time, when conditions would have otherwise closed loop operation.

it may be your upstream o2 sensors,

Possible Causes

FUEL DELIVERY SYSTEM
ECT SENSOR, WIRING, OR CONNECTORS
MAP SENSOR, WIRING, OR CONNECTORS
O2 SENSOR, WIRING, OR CONNECTORS
ENGINE MECHANICAL SYSTEM
POWERTRAIN CONTROL MODULE (PCM)

after the repair, it will take 3 good trips to turn off the MIL
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Old 10-14-2013, 11:56 PM
ss0320 ss0320 is offline
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Default

I'm using 5w 20 synthetic. I never received this code until I moved down south from Chicago. Didn't know if the climate change had anything to do with it. I've changed the 2 down stream sensors since I was getting that code prior and now I'm getting the upstream, guess I should have changed them all. I appreciate the reply, good information.
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