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SES light on P0171 and 174Shdwstrr 09-08-2006, 09:52 AM Let me start with this is my first post here, I have been following this forum for a while now and you guys are great. I have fixed several problems with my Blazer with the info here. My problem now is that I flushed my radiator, installed a new thermostat and cap and the next time I went on a trip the SES light came on:banghead: . The first code was 174 Bank 2 too lean. That one was cleared and then three weeks later the SES light comes back on and it now show 171 Bank 1 too lean. Can any one tell me what is causing this? 97 Blazer 4dr 4X4 LS 124,000 Shadowstarr muddog321 09-08-2006, 11:03 AM Read this- its a simple one: http://www.obd-codes.com/trouble_codes/generic/p0174-system-too-lean-bank-2-oxygen-sensor.php Shdwstrr 09-08-2006, 02:41 PM Thanks muddog, I will check the MAF tonight when I get home. Great link also. vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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