Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 12-02-2009, 06:46 PM
Registered User
 
Join Date: Dec 2009
Posts: 4
P0133 P0140 After Replacing Sensors

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

Searched web: code P0140 is not listed in Mercedes startechinfo.com, it is probably a generic OBD. Found info somewhere that 140 follows P0133 so I should concentrate on this one. Also, don't think it is fuel trim because it relates to one bank only. FYI: use Actron reader and E420 1997 has 130k miles. Works fine but I want to clear CEL.

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 no other codes for the sensors. Again: both sensors on Bank1 are new.


Additional info: when criss cross wires on left and right sensors got many codes related to malfunctioned sensors and missfire (but no 133 or 144) - which means that both sensors are read by the ECM.

Question 1: what to do next? I found in this forum that Ethan had problem with sensors even after replacing them but he did not posted solution from the Mercedes shop. Ethan, please respond.

Question 2: why the code P0140 is not listed on the official Mercedes StarTech for my model - is it valid error?

Any suggestions?

Last edited by radeko1; 12-02-2009 at 06:53 PM.
Reply With Quote
 

Bookmarks

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 04:59 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page