 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Ford / Ford Explorer / January 2005Trouble Code P0420
My scanner says "System efficiency below threshold" my Chiltons book says "catalyst efficiency monitor and/or exhaust system fault" for that code. Could it be the Oxygen Sensor? I have 70K on this one :( TIA > My scanner says "System efficiency below threshold" > my Chiltons book says "catalyst efficiency monitor and/or exhaust system [quoted text clipped - 3 lines] > > TIA Doh... found an archive post that suggests it's probably oxygen sensor. I forgot to mention I have 96 Explorer 4.0 4WD AT. I see in manual that there are 4 sensors. Should I replace all 4 if one is bad? TIAA >> My scanner says "System efficiency below threshold" >> my Chiltons book says "catalyst efficiency monitor and/or exhaust [quoted text clipped - 7 lines] > I forgot to mention I have 96 Explorer 4.0 4WD AT. I see in manual that > there are 4 sensors. Should I replace all 4 if one is bad? TIAA Double Doh. Found another post that suggested having the PCM re calibrated or reset first. Something about the trouble code being stored in memory. It cost $90 but the trouble code hasnt come back after 200 miles. Seems like an inherent flaw like that should have been paid for by the factory. Oh well, Kragen said they would take the 02 sensors back. How many miles did you have on when you did this? This code came up on mine also. I did do the cat replacement, as my mileage was high, and I haven't had the code come on again. I haven't had my PCM recalibrated. Anyone know what that's all about? Is this a dealer only type thing requiring special equipment? Paul >>> My scanner says "System efficiency below threshold" >>> my Chiltons book says "catalyst efficiency monitor and/or exhaust system [quoted text clipped - 13 lines] > like an inherent flaw like that should have been paid for by the factory. > Oh well, Kragen said they would take the 02 sensors back. > How many miles did you have on when you did this? > [quoted text clipped - 5 lines] > > Paul I had 67K+ on it when the trouble code came up. As far as I know only the dealer can flash/recalibrate/reset the PCM but I'm not certain. I found the post about the PCM at http://www.ford-trucks.com/forums Haven't seen the post on your link. If it is referring to power programmers and chips, all these do is modify the spark and fuel curves as well as the rpm limits. They do nothing to the operating strategy that decides when to set the MIL and send a DTC to memory. In the past, Ford (along with most other marques) have approached the EPA for permission to alter the fault determination strategies to reduce the incidence of "nuisance" MILs. Dealers are the only ones with this sort of programming data. The original poster would have to go to the dealership and have his car connected to the WDS to determine if a later flash is available for the car. > > How many miles did you have on when you did this? > > [quoted text clipped - 9 lines] > the dealer can flash/recalibrate/reset the PCM but I'm not certain. I > found the post about the PCM at http://www.ford-trucks.com/forums |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.