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

4,235

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 of 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 of 1 people found this helpful.
4,235

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 242 nationwide Escort listings and the tools to find you a great deal.

ZIP:

Ford Escort Experts

  • #1
    Tom Demyan
    Reputation
    1,080
  • #2
    dandyoun
    Reputation
    880
  • #3
    tennisshoes
    Reputation
    440
View All

Related Models For Sale

Used Ford Focus
545 Great Deals out of 69,719 listings starting at $1,950
Used Ford Mustang
332 Great Deals out of 41,500 listings starting at $1,488
Used Ford Taurus
177 Great Deals out of 16,061 listings starting at $1,900
Used Ford Explorer
1,018 Great Deals out of 67,538 listings starting at $1,200
Used Honda Civic
555 Great Deals out of 52,396 listings starting at $999
Used Ford Ranger
131 Great Deals out of 4,928 listings starting at $499
Used Ford Fiesta
115 Great Deals out of 16,853 listings starting at $1,014
Used Honda Accord
766 Great Deals out of 89,440 listings starting at $1,444
Used Ford F-150
2,942 Great Deals out of 230,829 listings starting at $1,300
Used Toyota Corolla
928 Great Deals out of 70,472 listings starting at $1,250
Used Toyota Camry
1,084 Great Deals out of 76,695 listings starting at $1,100

Used Cars For Sale

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.