Engine Code 28 - Rear main o2 sensors?
Engine Code 28 - Rear main o2 sensors?
Hi there, today while I was driving home from school I had to make a somewhat hard stop, and as soon as I had slowed down I looked at my guages and saw the "Check engine" light on. So when I got home I ran the diagnostics and got a code 28 (Rear main Oxygen sensor). SO, what Im wondering is:
1.) How important is it that I fix this?
2.) Can I just get one of those $50 dummy O2 sensors?
3.) What exactly does the rear O2 sensor do?
4.) What should I do
?
Ok, thank you very much, any help is appreciated.
PS. Its a 92 SC300 5-speed with 107,xxx miles
1.) How important is it that I fix this?
2.) Can I just get one of those $50 dummy O2 sensors?
3.) What exactly does the rear O2 sensor do?
4.) What should I do
?Ok, thank you very much, any help is appreciated.
PS. Its a 92 SC300 5-speed with 107,xxx miles
http://www.trademotion.com/partlocat...92&catalogid=1
$120 for the rear O2 Sensor.
I'm pretty sure the dealer would ask for more though.
$120 for the rear O2 Sensor.
I'm pretty sure the dealer would ask for more though.
Pole Position
Joined: Dec 2001
Posts: 330
Likes: 8
From: California
There is a high probability that you SHOULD replace it. The right thing to do is to follow the complete procedure in the shop manual to determine with 100% certainty that it is the sensor and not something else. You may want to try to clear the code and see how long it takes to come back on. I found that it would clear on my car and come back after "spirited driving."
That said, it is highly likely that the O2 sensor has gone bad as these things happen over time - I just replaced one of my O2 sensors a few months ago. If you ignore the problem, you run the following risks:
1) There really is a problem, and you could be damaging you engine.
2) There is no "real" problem now, but if you do encounter a problem you will not have a warning and do damage to your engine, or WORSE something else goes wrong and you have no idea because your check engine light is "normally" on.
If you need to wait a few days because it is an inconvenient time to get it done it very well may be worth the risk - what I did. But, if you are asking "should I ever bother to fix this, or let it go an extended time" the answer is NO. This is a Lexus, not a Yugo, these cars are worth maintaining properly.
That said, it is highly likely that the O2 sensor has gone bad as these things happen over time - I just replaced one of my O2 sensors a few months ago. If you ignore the problem, you run the following risks:
1) There really is a problem, and you could be damaging you engine.
2) There is no "real" problem now, but if you do encounter a problem you will not have a warning and do damage to your engine, or WORSE something else goes wrong and you have no idea because your check engine light is "normally" on.
If you need to wait a few days because it is an inconvenient time to get it done it very well may be worth the risk - what I did. But, if you are asking "should I ever bother to fix this, or let it go an extended time" the answer is NO. This is a Lexus, not a Yugo, these cars are worth maintaining properly.
alright, thank you very much
i just bought a multi-meter thing and Im going to test the oxygen sensors today or tommrow (if i can ever figure out to use this damn thing lol)
if they really are dead, then I will try to find a replacement O2 sensor as soon as possible.
thanks for your help
i just bought a multi-meter thing and Im going to test the oxygen sensors today or tommrow (if i can ever figure out to use this damn thing lol)
if they really are dead, then I will try to find a replacement O2 sensor as soon as possible.
thanks for your help
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TomWahjudi
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Mar 2, 2003 09:47 PM
