Question about 1999 Ford Explorer

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My engine has a severe miss they said i need a new o2 sensor does this sound correct

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An O2 sensor, huh? No, that doesn't sound correct, but it might be a good idea to replace it anyways if it hasn't been done yet. The problem is more likely to be your spark plug wires. If that doesn't work, have your timing checked out by a professional...

Posted on Jul 10, 2010

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Posted on Jan 02, 2017

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I have a 2005 maxda rx8 changed the plugs and wires and lower o2 sensor picked up a miss in it think it might be coil packs ?


If you didn't have a miss before, then I would suspect the new plugs or wires. Just use your old ones to replace them one at a time.
The new O2 sensor shouldn't create a miss even if it wasn't working. (Not only that, you'd shortly get a check engine with the O2 code.)

Oct 02, 2016 | 2005 Mazda RX-8

1 Answer

Engine has severe miss @ idle under load. Runs fine when driving. Plug and Plug Wires are Ok. Put on a Scanner and got code Po135.


The DTC (Data Trouble Code) P0135 is for the O2 sensor Heater Circuit Bank 1 Sensor 1. Bank 1 will always be the cylinder bank with the number one cylinder and spark plug, and the number one O2 sensor will be located before the catalytic converter and usually at the rear of the exhaust manifold or just after it. According to the firing order diagram bank one is the cylinder bank that is closest to the fire-wall and there should be an O2 sensor located there around the rear of the exhaust manifold or just after it. If the engine is a 4 cylinder then it will be the O2 sensor before or up-stream of the catalytic converter. Check for any damaged wiring or loose wire connector at the O2 sensor and if they are alright then replace the O2 sensor and then re-set the check engine light. (The auto part store should re-set the check engine light for you if you purchase the O2 sensor from them, and be certain that it is the correct and assembled O2 sensor for your vehicle and not a put together universal O2 sensor)




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Nov 29, 2010 | 1996 Mercury Mystique

2 Answers

My 2005 Hyundia Elantra is showing engine code P2251. What is that?


P2251 L.O2 reference circuit(-) open-Sensor 1. This code is showing a problem on the reference voltage of the upper O2 sensor. It might be sensor or the wiring. P0304 Cyl.number 4 Misfire detected. This code is showing 4th.cylinder is or has been missing. Second code might be set by first code.O2 sensor problem needs to be corrected first.

Sep 09, 2010 | 2005 Hyundai Elantra

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1999 ford explorer with a severe miss i was told i need an o2 sensor does this sound correct?


NO,not really,the o2 just gathers information for the most part,unless it is sending incorrect data,it most likely is another problem.

Jul 10, 2010 | 1999 Ford Explorer

1 Answer

Have this code PO171, what does this mean.


Not sure that the O2 sensor was bad. It sounds like it was telling you that side of the exhaust system was picking up a lean mixure at the O2 sensor. The O2 sensor was doing its job by telling you the mixture changed. If the O2 sensor was bad, it would say low voltage range for that sensor, or open curcuit.
Now the car has had time to do its diagnostic sweep, it is telling you the same thing, but from a different sensor...the fuel mix is too lean. Air/spark/and fuel is what you need in the correct amounts. In your car, the ECM engine control module controls this by taking readings from all the sensors several hundred times a second.
Mechanically, you have a few options. Change the fuel filter...under the car on the passenger side. It is an easy job.
Change the fuel pressure regulator. This keeps the fuel at 4 BAR so the fuel injectors can do their job correctly. This job just needs a screw driver to pop off the clip that holds it in place. No hoses need to be removed. It is on top of the intake manifold, in-line with a metal fuel line and a rubber one.
The fuel injectors could be clogged up on one side of the engine. Run some fuel injector cleaner through a tank of gas. Also, listen for a constant ticking sound at each injector. If one sounds off PAR, then replace it.
The fuel pump may not be giving you enough power. However, the readings seem to be localized to one side, so I doubt it.
Start with the easiest thing, and see if it works. Also, you will need to get yourself a VAG scan tool. It is the only one with codes in it for all of your VW systems, not just engine codes like the ODB scanners. You can get a nice one for $50 on-line.
Good Luck!

Feb 24, 2010 | 2002 Volkswagen Passat

2 Answers

96 Dodge Neon O2 sensor Ckt No Activity bank 1 sensor 1----how do I replace the sensor, will that correct a problem with the check engine light?


That would correct the problem, the O2 sensor is on the exhaust manifold or on the exhaust manifold down pipe. If you go to Auto Zone, they will have the O2 sensor you need and also the loaner tool you may need to remove the O2 sensor. Auto Zone also can give you the step by step instructions to replacing the O2 sensor in about 30 min. Once you located the O2 sensor, disconnect the wire harness and use the O2 sensor socket to remove the sensor from the exhaust. It's like removing a spark plug, to install the new O2 sensor is just to follow the same procedure in revers to the removal. Good luck.

Oct 28, 2009 | 1996 Dodge Neon

2 Answers

1993 buick untra runs rough


you need new engine oil in the car... and air filter

Jun 30, 2009 | 1993 Buick Park Avenue

1 Answer

Locate O2 Sensors in 1994 Cadillac ElDorado


o2 will not make your car do that you have other issues check for secondary ignition miss or primary ignition miss sounds like you are dropping a cylinder dumping raw fuel to contaminate 02 sensor find the real problem to fix your light

Nov 22, 2008 | 1994 Cadillac Eldorado

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