I own a 99 ford escort zx2 and my check engine light has been on for quite sometime now and I have gotten it checked. It says switchessensor indicates lean. I have replaced the O2 sensor and I cleaned the MAF sensor yet I am still having this problem. If you know anything about this problem please let me know.

Asked by Apr 05, 2012 at 10:07 PM about the 1999 Ford Escort 2 Dr ZX2 Cool Coupe

Question type: Maintenance & Repair

3 Answers

4,575

Without the actual code number I can only guess but the common lean causes are clogged fuel injectors, O2 Sensor failure or an intake leak. Now, there are two O2 sensors, one in front of and another behind the catalytic convertor. However, when these fail they usually have their own code. Check for cracked, loose or disconnected hoses around the intake manifold/throttle body and add a can of high quality (Lucas, STP, Techron) injector cleaner to your fuel and drive a couple hundred miles. Less frequent is if too much ethanol is present in the fuel. If you inadvertantly dispensed E85 into the tank to bring the ethanol content to around 40% or more, you'll get the same code. If this was the case simply drive it out and refill with regular unleaded. A one time occurence won't hurt anything. Let me know the exact code number and I'll see if anything else comes to mind. Good Luck!

2 people found this helpful.
15

my check engine light is on constantly as well. it threw a code for being to lean, right now the code number is slipping my mind. being in school for auto mechanics we worked on it for a whole day to find out why. figured out that it was the DPFE sensor(im pretty sure thats the intials, the differential pressure feedback EGR thing lol) which does nothing to harm or help the car, its like a 50 dollar part that we arent going to replace lol.

1 people found this helpful.
4,575

A piece of black electrical tape over the light will take care of it then! Glad you found it. Stuck EGR can cause lean as well. Bad sensor info can make light w/o real problem too!

Your Answer:

Escort

Looking for a Used Escort in your area?

CarGurus has 206 nationwide Escort listings and the tools to find you a great deal.

ZIP:

Ford Escort Experts

  • #1
    Tom Demyan
    Reputation
    1,110
  • #2
    dandyoun
    Reputation
    940
  • #3
    tennisshoes
    Reputation
    470
View All

Related Models For Sale

Used Ford Focus
514 Great Deals out of 76,283 listings starting at $800
Used Ford Mustang
303 Great Deals out of 40,193 listings starting at $1,312
Used Honda Civic
488 Great Deals out of 44,847 listings starting at $1,150
Used Ford Explorer
926 Great Deals out of 70,971 listings starting at $1,275
Used Ford Fiesta
136 Great Deals out of 17,378 listings starting at $1,000
Used Toyota Camry
863 Great Deals out of 71,819 listings starting at $1,300
Used Ford F-150
2,357 Great Deals out of 199,530 listings starting at $1,300
Used Toyota Corolla
728 Great Deals out of 64,330 listings starting at $1,499
Used Ford Taurus
208 Great Deals out of 16,267 listings starting at $600
Used Honda Accord
728 Great Deals out of 103,269 listings starting at $999
Used Ford Crown Victoria
5 Great Deals out of 751 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.