MuRKRoW Posted July 26, 2012 Report Share Posted July 26, 2012 It's not your o2 sensor. Your engine putters right before the code comes on indicating that your air/fuel mixture is lean (too much air). It could be a vacuum leak. It could be a problem in your fuel system (fuel pump, fuel filter, injectors). Or maybe even a random misfire. Do a compression test and see if they're all within a close range. Does your engine have an EGR valve? It could be a sign of the EGR valve sticking open and choking the engine. What engine does that have? Quote Sound Solutions Audio ZCON 18 Crescendo Audio BC3500D JVC KD-R80BT headunit Alpine/Pioneer mids & highs 4 group 34 agm batteries Knukonceptz 3x0ga. terminals Kicker/XS Power 0ga. wiring Link to comment Share on other sites More sharing options...
Pitbullx Posted August 7, 2012 Report Share Posted August 7, 2012 check for vacum leaks and have someone with a brain dio the problems Quote Team Devastation Mixed Martial ArtsMachado Brazilian JiujitsuOnce I lock it on there's no escape I don't train to make you tap, I train to tear your arm, leg, or head off. Its your job to tap before I can do that -Pain is only weakness leaving the body, its kill or be killed and only the strong survive...Rockford FosgateDigital DesignsFi Car AudioCrossfire Car Audio Link to comment Share on other sites More sharing options...
79Bronco Posted August 30, 2012 Report Share Posted August 30, 2012 (edited) P2195 O2 snesor signal biased/stuck lean B1S1 Description: A heated oxygen sensor inticating lean at the end of a test is trying to correcto for an over-rich condition. The test fails when the fule control system no longer detects switching for a calibrated amount of time. Possible Causes: Electrical: Short to VPWR in the harness or HO2S Water in the harness connector Open/shorted HO2S Circuit Corrsoion or incorrect harness connections Damaged HO2S Damaged Powertrain control module (PCM) Fuel System: Excessive Fuel Pressure Leaking\contaminated fuel injectors Leaking pressure regulator low fuel pressure or running out of fuel vapor recovery system Induction System Air leaks after the mass air flow sensor Vacuum leaks PCV system is leakiing or the valve is stuck open Improperly seated engine oil dipstick EGR System Leaking gasket Stuck EGR Valve Leaking diaphragm or EVR Base Engine Oil overfill Camshaft Timing Cylinder compression Exhaust leaks before or near HO2S Edit: Without hooking up to the scanner and seeing the fuel trims and live data some of the above would be hard to diagnose. 96 Expy, you've either got the 5.4 or the 4.6 (96 was the last year for the 4.6 in the expy) Concerning O2 sensors, there are multiple O2 sensors in this vehicle. There should be at least 1 for each exhaust bank, but most likely there are 4 sensors in total. You can crawl up under your truck and look to see how many. Find out which ones were replaced and why. Also make sure that they replaced them correctly. While you're under there, check for any exhaust leaks that may be present. Start with the Induction system. Pop the hood, check (listen) for any vacuum leaks coming from the engine. Go ahead and run through the list that ^ was nice enough to post. I'm guessing this isnt an electrical or EGR system problem since you say the problem is intermittent. This leads me to believe that you may need to have your fuel injectors or your injector rail replaced. Before you go and get that done, start with the small, simple stuff. Good luck! Edited August 30, 2012 by 79Bronco Quote Source: Parrot Asteroid Smart Processor: Digital Designs X1 Amps: Soundstream Ref 4.920 + Soundstream Ref 4.400 + Soundstream DTR 3400 Front stage: Hertz 165xl + HL 70 + HT28 Rear fill: Hertz 165xl Subs: 2 SA-12's 3-way active ftw Link to comment Share on other sites More sharing options...
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