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Where is o2 sensor

Very hard starting stalls at idle rubber smell

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  • 36 Answers

Usually connected directly to the exhaust at various locations, you could have up to 4 02 sensors and need a special socket that is worth buying, it allows for the wire has a long slit and is a deep socket in various sizes

Posted on May 10, 2013

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Posted on Jan 02, 2017

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SOURCE: engine light on 2002 mazda protege is on even after changing o2

Try cleaning the Mass Airflow (MAF) Sensor. My 2002 Protege check engine light came on and it started stalling at stoplights if I didn't keep the engine revved a little. Manager at AutoZone checked the computer code for the light (P0171?), and it said it was running lean. He suggested I try the MAF sensor cleaner they have ($6.99) rather than replacing the 02 sensor, etc.; it made a *significant* difference. (I think I need to do it again to get it totally cleaned out, but the can is for at least 4 cleanings.) The MAF sensor is the large component that air goes through right after the air filter. If you don't have the repair manual for the car (search online for PDF's), you search for the part online to see what it looks like. Mainly, it's a tube about 4" across with some small wire things inside. The cleaner can said it was a 10 minute job; mine took 20 minutes, but only because the tube leading from the MAF sensor to whatever is next (a kind of bent elbow tube, with a couple of accordian-style ripples) tore, and I had to duct-tape that up to seal it. (Still haven't gotten that replaced - found them online for ~$40. Maybe this weekend...)

Posted on May 16, 2009

fingaz22
  • 1068 Answers

SOURCE: 2000 Pontiac Sunfire, 2.2 litre engine, automatic.

i wouldn't be looking at the o2 sensors! look at the coolant temp sensor! when the car is cold it doesn't correct fuel & air ratio until it is warm so it is not looking at the o2's till then! if the sensor is bad and telling the computer it is warm when it is cold them it would be leaned out and run like that then when the car gets warm it's fine because the sensor is still saying it's warm! would be the opisite if it went bad and was telling the computer it was cold! that is a sure sign of the temp sensor being bad! good luck

Posted on Sep 18, 2009

Testimonial: "Thanks. I'll look into that. Coolant sensors are a lot cheaper than O2 sensors too. :-)"

  • 31 Answers

SOURCE: rough idle. stalling,hard starting

It is probably your IAC valve.

Posted on Sep 23, 2009

  • 6 Answers

SOURCE: car feels like it wants to stall while in idle

My daughters 2003 focus had this same problem and the same error code was reported. The auto parts store had her putting fuel system cleaner into her tank but this did nothing to alleviate the problem. If anything it was worse. I looked at it and heard a significant vacuum leak. A rubber elbow that was at the vacuum end of the vacuum tube coming from the valve cover had gotten oil on it and disintegrated. To determine if this is the same problem you have, spray carb. cleaner behind the intake manifold. If the idle picks up you probably have the same issue. $7 and a visit to the auto parts store later her car was fixed. Disconnect the battery for 10 minutes and then the computer will relearn its correct settings.

Posted on Dec 09, 2009

  • 5 Answers

SOURCE: 91 GMC G2500 5.7L 350 Stalling when warm

You should try looking at the transmission fluide, it must be short. If it is, you should go buy a transmission fluid. And make sure you car pipes has no leak.

Posted on Jan 11, 2010

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well the o2 sensors will not cause it to run like that, all they eill cause is an excessive use of fuel. try to clean out the throttle body and the IAC (Idle Air Control) sensor, these areas get pretty dirty and gunky, and cause the idle to be abnormal causing the computer to get incorrect readings from the mas sensor etc....

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I had same problems w/ my 99 Chateau 5.4L. EGR-Ensure port into intake and pipe from exhaust are clear using low pressure compressed air. Pull vacuum on EGR diaphram and ensure it opens and closes smoothly. If this checks out then problem is probably in the EGR sensor (mine had both ports and hoses clogged w/ aluminum corrosion from the sensor, cleaned out hoses and lines to exhaust pipe w/ compressed air, ended up having to change the sensor). IDLE AND O2 SENSOR- Caused by vacuum leaks in the PCV line (line is plastic wrapped w/foam insulation; was cracked under the insulation; both rubber end connectors at manifold and pcv valve were softened, collapsed and leaking; allowing excess air into the manifold after the mass air flow sensor which throws off the O2 sensors. engine computer does not read O2 sensors until after engine is warmed up which is why idle is fine until then).

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