Having problems with your 1997 Pontiac Grand Prix ?
HAVE A 99 GRAND PRIX WITH CODE P0171 SYSTEM LEAN-BANK 1. I REPLACED THE OXYGEN SENSOR ON THE REAR MANIFOLD THAT IS CHANGEABLE FROM TOPSIDE. LIGHT/CODE IS STILL COMING ON AND SHUTTING OFF BY ITSELF. CAR HAS A REMOTE STARTER BUT I DONT THINK IT IS RELATED.
Po171 is a lean code, and could be likely caused by a plugged fuel filter, or a weak fuel pump, I would recommend changing the fuel filter first since its cheaper.. The filter is located under the rear of the vehicle by the fuel tank, if this doesn't help run, or have run a fuel pressure check to determine if that is the cause. Also look carefully under the hood for any hoses or lines disconnected causing a vacuum leak, this can also cause a lean code
I sprayed brake cleaner around and under intake throttle and engine stumbled and even stalled
Repair Help & Product Troubleshooting for 1997 Pontiac Grand Prix
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