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98 Blazer o2 sensor Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine ODB2 Fault Codes marriedguyinlove420 New User Dec 11, 2007, 3:47 PM Post #1 of 3 (2734 views) 98 Blazer o2 sensor Sign In Please help me i have a 1998 Chevy Blazer 4door 4x4. I just put a new crate engine in and am having trouble with it trowing a p0135 code (heater circuit malfunction) bank one sensor one, anyways i have replaced it three times along with my catalytic converter and still the code comes back any ideas will be helpful thanks.. way2old Veteran / Moderator Dec 11, 2007, 4:25 PM Post #2 of 3 (2732 views) Re: 98 Blazer o2 sensor Sign In It must be a wit=ring problem then. That is all that is left. Look for broken or pinched wires. Being way2old is why I need help from younger minds DanD Veteran / Moderator Dec 12, 2007, 3:00 AM Post #3 of 3 (2727 views) Re: 98 Blazer o2 sensor Sign In After replacing the same sensor three times, you must realize that it’s not the sensor. Because you have just replaced the engine; I would be looking for something you missed reconnecting or damaged. The first thing that comes to mind are the O2 ground circuits; at the back of both cylinder heads there should be wired eyelets that should be bolted to the heads. Next would be to make sure that there is battery voltage at the wiring harnesses O2 connector’s pink wire. This voltage will only be there until the computer sees that the engine is up to operating temp & that the O2’s are on line, sending a return signal. Dan. Canadian "EH"   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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