99 F150 Lariat O2 sensors...

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- SMacIntyre
  
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posted
18 years ago

Mon, May 23, 2005 11:44 AM

Good Morning...

My 99 F150 v8 triton (Smaller V-8, not the 5.0) had it's service engine soon light come on. I had the codes read and it came up as a O2 sensor tripping it off. I have noticed in the last few months a lack of power and a little hesitation when I'm at about 30 and give it a little gas or when it is just about to downshift, occasional rough idle as well as decreasing mileage. From what I heard, this all ties together with a bad O2 sensor. My question is how many O2 sensors does the truck have? Is there an easy way to pinpoint which sensor it is? I'm not familiar with them, so can they be cleaned or do they have to be replaced? And lastly, how difficult is it to change them? When I had the code read the guy said the sensors go for about $125 each. Is this right?

Thanks in advance for any direction I get help from!

Scott

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- David M
  
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posted
18 years ago

Tue, May 24, 2005 2:14 AM

On Mon, 23 May 2005 07:44:35 -0400, SMacIntyre rearranged some electrons to form:

The trouble code should have told you which sensor was bad.

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- lugnut
  
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posted
18 years ago

Tue, May 24, 2005 11:48 AM

My response is in general terms. Your truck should have at least 2 and probably 3 sensors. The fault codes should tell you which one is the source of the code. That does not mean that the sensor is bad. It may just mean that it is the perveyor (messenger) of more (other) bad news. More diagnostic work may be required depending on the exact code. A bad sensor may cause loss of power, increased emissions and increased fuel consumption - so can anything else that results in a bad sensor reading. The sensors cannot in most cases be cleaned. Once they are contaminated or fail, that is just the way they remain. They can be replaced. The skill required to diagnose the cause of the fault code is much greater than that required to replace a sensor. The sensors are expensive. Go back and get the exact code and write down both the fault code and the error message instead of going into sticker shock induced brain seizure. Someone here can probably get you on the right track. You do not want to just start throwing parts at it until you correct the problem - that can result in severe financial distress..

Good luck Lugnut