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Gasman59

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2000 E320 4Matic Sedan
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Discussion starter · #1 ·
Hi Folks, it's been awhile.
My wife"s 2000 E320, 90K on the clock, Check Engine light came on. I had the code read and cleared at a local garage. It was an oxygen sensor.
Subsequently it came back on for a day after it was cleared, and now it has been off for over a week.
She admitted to putting a few tanks of Regular gas in her :mad:,
I filled it with Premium after the first time the warning came on.
So, is running regular enough to trip the O2 sensor, and going back to premium corrects it?
Pretty expensive part. dont want to replace it if not actually needed.
Thanks,
Ron
 
#3 ·
Gasman59 said:
dont want to replace it if not actually needed.
Thanks,
Ron
Click to expand...
Reg or premimum is fine for it, The o2 sensor needs to be data streamed and watched for switch time and for voltage changes. Switch time should be about a second or so, it should bounce from @ .001 volt to a little over a volt, and back and forth.

My money is on changing the o2 sensor.

Rock auto has them starting at 45.00, labor should be an hour. You should get out the door @ 100.00 - 120..00?
 
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#4 ·
Bosch says they are only good for 100,000 miles so you are close to that anyway. A lot of people suggest replacing all 4 at that mileage.
 
Discussion starter · #6 ·
Hi All: Thanks for your responses. I hate to leave threads open so here is the final resolution.
I brought her to my local garage. They pulled the code and indeed it was an O2 sensor.
They quoted $330.00 to replace the sensor and test the car.
Well, I ended up purchasing a really cool OBD2 reader with full text of the error codes, and all four sensors for about the same price.:D
Of course, Murphy's law kicked in again and the failing sensor is Sensor 1, Bank 2, or the most difficult one to change.
I have not done the "Bad" one yet as I am waiting for the special sensor socket to arrive.
Thanks again!
Ron Y
 
#7 ·
I have a 2001 E320 with the CEL that just starated illumincateing two days ago. What is the model of the OBD2 reader that you got? I would like to consider getting one so I can read the coes myself.
Thanks,
 
#8 ·
I just bought an Actron CP9125 ($50 at Sears) but you can get some other brand from Amazon for about $30 (highly recommended).
 
#9 ·
fastera said:
I have a 2001 E320 with the CEL that just starated illumincateing two days ago. What is the model of the OBD2 reader that you got? I would like to consider getting one so I can read the coes myself.
Thanks,
Click to expand...
Welcome. Please click user cp and edit details so you can add your vehicle and location to your profile, it's useful information when you're seeking assistance.

Any OBD-II code reader will read codes on your car (and any other OBD-II compliant car) just fine. For $30 you can get one on Amazon that will read and erase codes. Those return the alphanumeric codes and you can search or look in the table posted here for the translation. They're small and fit nicely under the front seat so it's handy no matter where you are.

As you go up in price you get a multiline display (probably like the one that prompted your post) that gives you the code as well as the translation. So instead of "P0302" you get "P0302 - Misfire Cylinder 2" or similar. To me that's not worth the expense, though. The hardest work is still diagnosing the issue that triggered the code.

If you jump to the $150 range you'll find some excellent units that will allow you to capture real-time data, which can be useful for someone with strong DIY and diagnostic skills. And if you want to go to a laptop setup you can use Carsoft, which uses the 38-pin diagnostic connector under the hood.

Of course if you're in the states (and not CA), cruise by autozone or some other auto parts stores and have them read the code(s). Get the actual codes, not their translation or attempted diagnosis. Then search or post them here.

Hope that helps.

Good luck.
 
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fastera
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