Code P0133 Even After Sensors Replacement - Mercedes-Benz Forum

Go Back   Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W210 E-Class
New User? Register - Forgot Password

BenzWorld.org is the premier Mercedes-Benz Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 12-01-2009, 06:05 PM   #1 (permalink)
BenzWorld Junior Member
 
Date registered: Oct 2009
Vehicle: E320 CDI 2005 with 120k miles
Location: Illinois
Posts: 6
Code P0133 Even After Sensors Replacement

Hello, please help.

Got codes P0133 (O2 bank1 sensor1 slow response) and P0140 (sensor2 no activity?). Replaced both sensors with OEM Bosch and cleared codes. Got the same errors. Cleaned MAF just in case, checked electrical connections, and checked for exhaust leaks. Same errors are comming back.

Searched web: code P0140 is not listed in Mercedes startechinfo.com for E420 (although it is on Sticky?!-why?), it is probably a generic OBD. Found info somewhere that 140 follows P0133 so I should concentrate on 133. Also, don't think it is fuel trim because it relates to one bank only(?). FYI: using Actron reader and E420 has 130k miles, spark plugs and air filter are 5k old. Car works fine but I want to clear the CEL.

Additional info: when criss cross wires on left and right sensors got many codes related to malfunctioned sensors and missfire (but no 133) - which means that both sensors are read by the ECM.

My next step is to check the voltage with AC/DC voltmeter - don't have a scope. What voltage should I expect with car in Park?

Any suggestions how to fix this code? Thanks.
radeko1 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 12-02-2009, 02:42 PM   #2 (permalink)
BenzWorld Junior Member
 
Date registered: Oct 2009
Vehicle: E320 CDI 2005 with 120k miles
Location: Illinois
Posts: 6
Update on P0133 and P0140

Here is more info:

I measured voltage at the sensors with voltmeter.
All sensors read .44V with KeyOnEngineOff and cold engine running. With hot engine running: Bank 1 sensors: S1 .1-.8V flactuates fast all the time. S2 flactuates slow and is more speed dependent: .2V @low, .7V @hi RPM. Sensors on Bank2 have the same reading as on Bank1 except S2 is not speed dependent.

Keep in mind that I don't know what the ECM is reading but should be the same since there are no other codes like "sensor mulfunction". Again: both sensors on Bank1 are new.

Thanks
radeko1 is offline   Reply With Quote
Old 12-16-2009, 08:01 PM   #3 (permalink)
BenzWorld Junior Member
 
Date registered: Oct 2009
Vehicle: E320 CDI 2005 with 120k miles
Location: Illinois
Posts: 6
Problem solved.
I rechecked everything and found super small exhaust leak. It was a hairline crack in the first, upstream CAT on the weld where cone is attached to the cylinder. Crack was so small that at low idle leak was only detectably when CAT was still cold. It is hard to belive system is so sensitive. After welding and several drive cycle (system goes through some kind of adjustment for the first 3-5 drive cycles) the codes did not showed up anymore.
Similar problem and solution were posted by Benz97 on 10/22/09.
radeko1 is offline   Reply With Quote
Reply

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W210 E-Class

Bookmarks



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Topic Author Forum Replies Last Post
Code P0133 & P0140 benz97 W140 S-Class 7 12-16-2009 07:58 PM
OK I Give Up! P0133 code Problem fritzimax R170 SLK Class 22 10-14-2009 04:43 AM
CODE P0133 ? fritzimax R170 SLK Class 4 10-29-2008 05:57 PM
Codes P0133 and P0136 rockonword W202 C-Class 3 06-15-2008 08:35 PM
P0133 and P0136 Ox Sensor Codes Set Yositimy R170 SLK Class 1 09-01-2005 07:20 PM


All times are GMT -7. The time now is 01:34 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.1

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.