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  #1  
Old 10-16-2012, 09:13 PM
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Default O2 sensor question

So ive got one or more of my O2 sensors bad on the truck. I know they are actually somewhat important in keeping good fuel mileage and even consistent power so Im just going to replace all 4 of them. They should be done after 75k miles and im just under 100k so its about time.

The question I have is I know the pre cat and the post cat sensors are different, but do the left and the right sides matter or will both pre cat be the same and both post cat be the same?
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Old 10-17-2012, 02:19 PM
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The only difference in side to side MIGHT be the connector. Other than that, they are identical.
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Old 10-17-2012, 06:39 PM
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Ive noticed as ive been looking for replacement ones some brands will include a side specific and some wont, they will only say pre or post cat. Im not sure why they would be any different, but I wanted to make sure before spending $150 on new ones.
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Old 10-18-2012, 03:39 PM
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look at rockauto.com. great deals on them. don't get bosch from what i hear.
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Old 10-18-2012, 04:25 PM
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How exactly do you "know" they are bad?

And I've never heard they need replaced at X miles. I ran my last truck 220k mile on the stock O2 sensors.

Post cat sensors, don't change them, they are purely for emissions.

If you have an engine light post the code, it may not be the sensor(s).
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Old 10-18-2012, 04:49 PM
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"Side specific" is/could be, the length of wire. The ones that aren't are (probably) both the longer length.
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Old 10-19-2012, 02:52 PM
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Quote:
Originally Posted by snrusnak View Post
How exactly do you "know" they are bad?

And I've never heard they need replaced at X miles. I ran my last truck 220k mile on the stock O2 sensors.

Post cat sensors, don't change them, they are purely for emissions.

If you have an engine light post the code, it may not be the sensor(s).
Ive had the code checked, twice actually by two different shops. After the guy at the first shop said they should be replaced for better fuel efficiency I wasnt really buying it becuse i know 90% of people dont ever replace them. So I asked my mechanic who ive gone to for everything ive ever owned and hes been a close friend for a long time. He actually said the same thing. when they go bad a lot of the time they tell your computer to keep the engine in "start up" mode so your burning a lot of extra un needed fuel. He also said its usually best to replace them all because they communicate with each other and if youve got one brand new one and the rest old they wont always communicate the way they should. Some, like most may thing all of them are only for emmissions, but Ive always trusted his word so its not worth not replacing them.
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Old 10-19-2012, 06:15 PM
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Well the downstream sensors ARE purely for emissions. The pcm only takes readings from the upstream sensors for air/fuel ratios.

What were the codes? It could be the catalytic converter(s) and not the sensors(or something else). Just because the O2 sensor triggers a code does not necessarily mean that the sensor is bad. Many mechanics misdiagnose these issues as they aren't up to date with OBD systems.

I would be sure of what you're replacing because O2 sensors are not cheap.
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