Check Engine Light

[97Explorer5.0]

I have a 1997 5.0L Explorer EB. The check engine light came on without any noticeable issues. I took it to a dealer and they ran the diagnostic for $75. They diagnosed the problem as "Bank #1 rear oxygen sensor, slow response. Reprogram PCM. Retest". The technician stated that the sensor is located above the converter and is somewhat difficult to access.

My question is, should I attempt to replace the sensor myself or let the dealer fix it for an additional $275 ($350 total). I am somewhat mechanically inclined (i.e. change oil/brakes). Your expert advise is appreciated.

Jack

 

[Jason_25]

Definitely replace it yourself. Even if you have to slip one of the neighborhood kids a 10 dollar bill to fit his hand in there. It's tight, but not impossible.

 

[mosinman]

Tip for the future. Buy a Haynes or Chilton's manual. They have all obd I and II codes. Autozone will pull your codes for free! Some independent shops will only charge $50. The manuals also go into detail on replacing your O2 sensors and only cost around $15. I'm a big fan of doing it yourself - but only with proper info available. Yes, I learned the hard way.

 

[kingsleysurf]

my 96 explorer that my mom handed down to me... had the check engine light on for 3 years... the bulb finally burned out so i didnt have to see it anymore,haha but now i have a new car and no check engine light anymore......

 

[rocco123]

Replacing the sensor is no big deal. As stated before you could have had Autozone test it for free.

 

[aldive]

Avoid the dealer like the plague. You can diy.

Consider investing in a code reader for the future,

Good luck.....

 

[97Explorer5.0]

Details Please...

Can someone provide me the following to changing O2 Sensor?

1. any special tools required?
2. based on diagnosis, where will I find the faulty rear sensor (#1 cylinder? technician stated above cat converter but difficult to access)

I am a diy'er and don't want to make the dealer rich.

 

[5.0Dad]

I used a long, thin, std. screw driver to release the clip on the wire connector while gently pulling on the sensor lead. Tnat was the hardest part. Then I think I saw a post saying you could get to the wires through the pass. side fender well.

According to Haynes, #1 is pass. side. On my 96 there is an upstream and a down stream sensor. Your tech said rear sensor (down stream?) and above the cat (up stream?). You might verify which one and see how many wires are on the lead. I was given the wrong one twice.

As for scanners, I really like my Auto X-Ray. It's more expensive but you can scan anything.

 

[rocco123]

I borrowed the wrench from Autozone for my Intrepid. Doesn't cost anything, just a deposit so they get their tool back. For the explorer, I just used an open end...think it was 7/8ths. The only difficult part was hooking up the connector, as it took 2 people. One on top and the other underneath the car.
Glad to hear you are going to DIY. Seeing someone just making an attempt gains my respect.