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CEL on again (my 2001.5 Passat)

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Old 11-09-2009, 01:12 PM   #1  
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Default CEL on again (my 2001.5 Passat)

Back again. A while ago my CEL was on, and cleaning the MAF sensor solved the problem.

This morning on my way to work, the light came on again. Read the code once I got to work, and it was P0135 O2 Heater Circuit Bank 1 Sensor 1.

From reading around a bit, it seems like this is the easier of the 2 to replace (this is the sensor before the cat, not the one after). But is also seems that access to this is from under the car. I have no way to work under my car, so it seems like I need to bring it to my mechanic again.

Anyone here replace their O2 sensor theirselves and can offer any advise to see if I should even try?
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Old 11-10-2009, 08:22 AM   #2  
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Originally Posted by admo View Post
Back again. A while ago my CEL was on, and cleaning the MAF sensor solved the problem.

This morning on my way to work, the light came on again. Read the code once I got to work, and it was P0135 O2 Heater Circuit Bank 1 Sensor 1.

From reading around a bit, it seems like this is the easier of the 2 to replace (this is the sensor before the cat, not the one after). But is also seems that access to this is from under the car. I have no way to work under my car, so it seems like I need to bring it to my mechanic again.

Anyone here replace their O2 sensor theirselves and can offer any advise to see if I should even try?
I had a Lexus RX300 with the check engine light come on for a sensor. It turned out to be a fuel/air ratio sensor that was on the side of the engine closest to the firewall. From what I read, it was a hassle to get to (had to be accessed from under the car also), and a bear to change when you find it. The part (not including labor) was going to cost about $400, and all it would do was improve my fuel economy by maybe 1 mpg.

I opted not to change it. I'm not sure what effect a bad O2 sensor has, but I would look at the cost and the benefit and decide then. Of course, then your CEL light will always be on, and you may not know when something else goes wrong.
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Old 11-15-2009, 06:19 PM   #3  
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Quote:
Originally Posted by admo View Post
Back again. A while ago my CEL was on, and cleaning the MAF sensor solved the problem.

This morning on my way to work, the light came on again. Read the code once I got to work, and it was P0135 O2 Heater Circuit Bank 1 Sensor 1.

From reading around a bit, it seems like this is the easier of the 2 to replace (this is the sensor before the cat, not the one after). But is also seems that access to this is from under the car. I have no way to work under my car, so it seems like I need to bring it to my mechanic again.

Anyone here replace their O2 sensor theirselves and can offer any advise to see if I should even try?
Look into changing it yourself, it's a no brainer IF and this is a big IF you can get at it. Otherwise just unplug it, get a large wrench to take it off then put the new one back in.

The car will run default settings which will make it run safe but rich. Your mileage will definitely go down when it's not working properly besides you won't pass a pollution test. Give your mechanic a call too, if it's not too hard to get at he may not charge too much.

Good Luck!
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Old 12-14-2009, 12:43 PM   #4  
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I remember saying this... then

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The light will be back, promise. You put a bandade on a wound that needs stiches. Cleaning the MAF yourself will not fix your problem, a new one will.
Here: http://www.highdefforum.com/car-foru...-myself-2.html

*Edit* the reason I bring this up is because the MAF "probably" caused your problem with the O2 sensor. My opinion, again, will be to get a new MAF clear the code see if it comes back, if it does then the O2 is really bad... which was caused by the MAF running the engine rich and killing the O2

Last edited by J-Rod; 12-15-2009 at 08:29 AM..
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