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Have 2000 Buick Lesabre custom every time car gets up to operating temp. the engine misses going down the road , also let car sit and idle and it shuts off after about 2 minutes , my code reads PO171 system to lean bank 1, changed co2 censor, mass air flow censor, plug wires, and plugs.
kind of tricky, took me an hour to get it figured out, but you got to opend the trunk and take out the 10 or so 10mm nuts sticking out of the backside of the lid, then the whole solid piece where the lights are on the back will slide off, then you can change the bulbs above the license plate and put it all back together
you have to open the trunk take the carpet off right next to the very back of car undo the 3-4 plastic wing nuts take light off of car change bulb ......reinstall reverse of taking off
I had to remove the entire light bar assy by taking every bolt loose to gain access to replace the tag bulbs on my 2000 Buick Lesabre. It is necessary to replace only one bulb so I replaced all bulbs with the new longer lasting bulbs...the bulbs are not expensive just impossible to gain access to them one at a time. It seems like GM made it so you would have to take it into the GM Dealer. A deep well socket makes the task muck easier! Hope this helps!
under the relay cover should tell where they are. you could switch one with another next to it to diagnose. then maybe ck cooling fan itself by unplugging and powering it up manually with power and ground to connector. could even be coolant temp switch ocated on engine. is the engine lite on?
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