95 Caravan Check Engine Light

I've followed a couple topics about the Check Engine Light, aka MIL.

I turned the key switch on/off/on .... 5 times and get the following
blinks:

1,2,2,1,5,5

I'm not sure how to intrepret them.

Anyone have any idea?

Mike

 

The first two digits are a code 12 which means start of codes. The last two
digits are a 55, which means end of codes. The middle two are your problem
and this is a code 21. I believe this is identifying an oxygen sensor
problem. Do a Google search on this code using some keywords like "Chrysler
Engine Diagnostic Code 21" and you will likely find a lot of useful
information. Here is one page I found right away that provides some info
for you on codes and proper procedure (on-ff three times not 5):

http://minimopar.knizefamily.net/fault/index.html

Bob

 

Bob,

Thanks, it has been running rich.

BTW, What kind of spark plugs would you put in there?

Bosch or A/C Delco?

Mike

 

Champion are the recommended original equipment and seem to be best based on
negative feedback on the other two choices you named.

Bob

 

Crap, I just came back from installing the front 3. I bought Delco.
Yes, the ones I removed were champion. I had to choose between Bosch
and Delco. The guys in the shop recommended Delco.

I was under the car looking at the back 3. I didn't have time to
install them though.

Do you think changing them from below is the easiest method?

Looks like I'll have to get a long screwdriver to push the plug cap
off.

Mike

 

Mine (95 3.0 Ltr) came with NGK's installed.
Not being a fan of AC or Champion, I have always replaced with same.

 

Much easier (IMHO) to remove the air box on top and get them from the
top-side.
#1 can be a pain in the A$$ due to the alternator bracket, but can be gotten
without removing bracket if you have a
knuckle attachment for your ratchet.

 

As I recall, I accessed two of the rear plugs from underneath the vehicle
and removed the rear alternator bracket and accessed the worst plug
(passenger side rear) from the top side. Note that I did not need to remove
the alternator and it did not move since it was secured by a front-side
bolt.

With regard to the plugs, NGK are an excellent brand and were used as
original equipment with the Mitsubishi 3.0 engine. As I recall the OP had a
Chrysler 3.3 or 3.8L and these came with and work best (in my opinion) with
Champion.

Bob

 

NGK's are the best. NExt time.

BTW, reading back up at the original post about my "Check Engine
Light". I replaced the O2 sensor and the light does not seem to go on
anymore. Not on in either 2 times it has been driven.

How long before the codes get changed back to the default?

Is 1,2,5,5 the default?

Thanks,

Mike

 

This should return back to 5,5 after I believe 20 starts.