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

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

Posted on Jul 10, 2010


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My 1999 Ford Explorer Sport 4.0 SOHC will cold start and idle till the gas runs out.Will not restart unless it is floored and then miss

Sounds like upper o2 sensors are bad. May also be other things like a dirty idle air valve, fuel regulator, fuel filter, air filter, etc. Do all the maintenance then re-evaluate. And the problem with o2 sensors may not give you a code.

Aug 13, 2015 | 1999 Ford Explorer

1 Answer

Ford explorer oxygen sensor

the o2 sensor is located by the catalytic converter and anaylyses the exhaust emissions,it may need a tune up but first i'd check all air intake hoses for leaks ,signs of wear etc as if the air/fuel mixture going into engine isn't correct the emissions will not be either ,you can get fuel additives which will clean cylinder,valves and the cat converter so try this first , if the light is still on get the garage to clear the OBD memory and retest drive as a stored code isn't always automaticly erased

Mar 29, 2014 | 1996 Ford Explorer

1 Answer

92 ford explorer 4x4 4.0L .. loss of power .. smell of gas ... seems like it running rich. Replaced plugs, wires and the one O2 sensor. MAF looks clean .. don't know if it's good though. Need to check for...

That sounds like a possibility. Your engine management system has a cold start circuit. It is equal to a choke. It will keep the mixture rich and limit the engine spark advance. Both affect performance.

Autozone and Oreillys will do a free scan which may pick this up. You would need to change the correct sensor which is usually different than the sensor that operates the dash gauge. A "cold start" condition is a normal occcurence; the duration of the Cold start is something the scanners may not catch.

These types of problems would show up in O2 problems and Rich bank conditions after your Catalytic converter starts complaining. This should not cost much to get you back to 100%.

Aug 31, 2010 | Ford Explorer Cars & Trucks

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

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...

I’m happy to help further over the phone at

Jul 10, 2010 | 1999 Ford Explorer

2 Answers

Rough idling on cold starts until the engine is

Very probably needs a general tune up to set the timing properly.

Nov 04, 2009 | 1999 Ford Explorer

1 Answer

Oxygen sensor for 1999 ford explorer

97 ane 97 have 4. I will assume that yours does too.

Go under Explorer.
Trace exhaust maniford from engine to catalytic converter.... in that path, you will find an O2 sensor (looks like a spark plug right in the exhaust pipe).

Same item on other side.

Now, sad part. You MAY find 2 more O2 sensors just after the converter!!

Autozone can usually do a free diagnostic on your vehicle and tell you which 1 or 2 sensors are bad.

Oct 24, 2009 | 1999 Ford Explorer

2 Answers

Ford 4.0 v6 misfiring

yes an o2 sensor can cause the mixture to go lean or rich. But you have another culprit also a knock sensor can cause this also. for the miss this is more of what the knock sensor would control. Hope this helps you

Jan 17, 2009 | 1994 Ford Explorer Limited

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