bigredfisher Posted September 8, 2009 Report Share Posted September 8, 2009 hi i am puzzled. i did a test on my car (2002 sunfire) with the computer and i came up with the code p0040 and it read a emission control failure. I looked it up on the internet and i got this * Crossed HO2S harness connectors (upstream). * Crossed HO2S wiring at the harness connectors (upstream). * Crossed HO2S wiring at the 104-pin harness connectors (upstream). what might this be? also how many o2 sensors are on my car and where are they located? thanks. I am getting crappy milage and it seems like my car only has half the power. I know for a fact that i am burning too much gas. any other things that this might be and how i could fix this. should i still replace the sensors????? bigredfisher thanks again. Link to comment Share on other sites More sharing options...
Greencoachdog Posted September 8, 2009 Report Share Posted September 8, 2009 Take it to a qualified mechanic! Link to comment Share on other sites More sharing options...
Whitespinnerbait Posted September 8, 2009 Report Share Posted September 8, 2009 Open hood look down at exhaust manifold ....staring right at you will be the o2 sensor..you will need the proper socket to remove it ..not a pair of Vise Grips... Link to comment Share on other sites More sharing options...
Whitespinnerbait Posted September 8, 2009 Report Share Posted September 8, 2009 BTW... A Sunfire never had any '' Power '' to begin with... Link to comment Share on other sites More sharing options...
bigredfisher Posted September 9, 2009 Author Report Share Posted September 9, 2009 bump please give me some advice. Link to comment Share on other sites More sharing options...
anders Posted September 9, 2009 Report Share Posted September 9, 2009 GCD did....take it to a qualified mechanic! thats what i did with my o2 sensors...i wouldnt play with them Link to comment Share on other sites More sharing options...
Raf Posted September 9, 2009 Report Share Posted September 9, 2009 i dont know your particular model but O2 sensors are easy to replace, get the right socket. Link to comment Share on other sites More sharing options...
Headhunter Posted September 9, 2009 Report Share Posted September 9, 2009 Brother, this aint no help desk! You put it out there and if people can help or WANT to help, they will. I have experienced much joy here and have had many, but not ALL of my questions answered. Sometimes, our question is just not something people are able to answer or they fear providing answers that my direct you inappropriately... you get what you pay for! HH Link to comment Share on other sites More sharing options...
PMack Posted September 9, 2009 Report Share Posted September 9, 2009 (edited) you have 2 o2 sensors on that car. find out if its the upstream one or the downstream one that needs replacing, then cut the wire put a regular deep socket on it, crank it out. then hit a napa and get the o2 sensor and the o2 socket (get the longer one of the two sockets) and plug in and play. Cheers, PMack Edited September 9, 2009 by PMack Link to comment Share on other sites More sharing options...
aplumma Posted September 9, 2009 Report Share Posted September 9, 2009 You might want to shoot a P.M. to a few of the boards mechanics they will answer it when they get a chance so be patient. I have answered alot of questions that have landed in my box about plumbing. Link to comment Share on other sites More sharing options...
MillerPhoto Posted September 10, 2009 Report Share Posted September 10, 2009 If you change it yourself in the driveway and its the O2 Sensor which is closest to the manifold.. Expect to use a wrench and propane torch.. Had to heat it before it would break free. But once changed it was good to go. Pull the battery cables for atleast 30min so that the computer resets itself, both cables.. not just the negative.. Link to comment Share on other sites More sharing options...
Raf Posted September 10, 2009 Report Share Posted September 10, 2009 running the car, getting that exh. manny/o2 sensor housing hot will eliminate the need for a torch just be careful, dont burn yourself. Link to comment Share on other sites More sharing options...
Bernie Posted September 10, 2009 Report Share Posted September 10, 2009 What is the 8th digit in your VIN? 3 different engines are possible in that car. Also verify the code # for me. Doesn't look right. Link to comment Share on other sites More sharing options...
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