KHE Posted June 30, 2010 Report Share Posted June 30, 2010 I drove the '96 Seville yesterday and the SERVICE - EMMISSIONS SYSTEM message displayed on the DIC so I pulled the codes. PC 0138 CURRENT - HO2S circuit high voltage bank 1 sensor 2 (Pre-converter sensor) PC 0151 CURRENT - HO2S Circuit low voltage bank 2 sensor 1 (sensor on front exhaust manifold) PC 0154 HISTORY - Insufficient activity bank 2 sensor 1 (sensor on front exhaust manifold) This code was current a week ago. PC 0174H Fuel trim system lean bank 2 I'm thinking the oxygen sensor on the front exhaust manifold is starting to act flakey. I'll have a look tonight to see if any wiring connections are loose or touching anything as well as clean all the fuse contacts in the underhood fuse panel. A flakey O2S on the front manifold might explain the PC 0151, 154 and 174 codes but not the 0138 code. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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