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Old 12-19-2010, 01:01 PM   #1
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Engine light after oil Change?

Friend took his Rav 4 to Fletchers for service and oil change.
It returned with his check engine light on. They wanted many $'s to fix it.
His is still on

I took my 06 Wrangler to Fletchers for Oil Change and lube only!
20 miles later, my engine light came on and has stayed on for about 100 miles now. I have gone through many starts and stop, put in some 89 octane, checked the gas cap etc. Still on. This light has never come on before and there is about 42K on it.

Question for the experts: Can a Technician cause the light to come on or is this a coincidence?

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Old 12-19-2010, 01:08 PM   #2
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My opinion-Yes it is possible-but don't know how likely it is. What codes are coming up to go with the engine light? Have you cleared the codes and did it come back? (from your post don't think so) There are "shady" shops-part of the reason I TRY to do most of the work my self-or know what is being changed before they do it. Does your Jeep still drive "okay"?

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Old 12-19-2010, 01:09 PM   #3
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tell us the codes its throwing and we can help.
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Old 12-19-2010, 01:11 PM   #4
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cycle your key 3 times, (1. on, off, 2. on, off, 3. on,) it should start saying codes on your odometer. P0.... let us know what it says, then we can help you.

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Old 12-19-2010, 01:24 PM   #5
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Thanks

Wow! Thanks for the quick response and the clear instructions to find the code. I was doing it wrong! Haven't had a Jeep with computers before this.

The code come up as 72.1.

Is there another process for clearing.

Thanks again, it is appreciated.

Jim
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Old 12-19-2010, 01:29 PM   #6
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Quote:
Originally Posted by Sonorasun View Post
The code come up as 72.1.

Jim
You are doing something wrong or reading it wrong. OBDII codes are "P" and a three digit number. If there is nothing it will say Pdone
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Old 12-19-2010, 01:43 PM   #7
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Originally Posted by Neil F. View Post
You are doing something wrong or reading it wrong. OBDII codes are "P" and a three digit number. If there is nothing it will say Pdone
Thanks Neil, I was apparently doing it wrong. It's an old guy thing!

The code comes up with a P2096, then done!
Actually a 4 digit number so hope that's correct.
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Old 12-19-2010, 01:49 PM   #8
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Coincidence or not.....there's no way in hell that I'd ever go to "Fletchers" again!!
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Old 12-19-2010, 01:50 PM   #9
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From the interwebs:

P2096-DOWNSTREAM FUEL TRIM SYSTEM 1 LEAN

Set Condition:
If the PCM multiplies short term compensation by long term adaptive as well as a purge fuel multiplier and the result is below a certain value for a calibrated amount of time over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.


Possible Causes

EXHAUST LEAK

ENGINE MECHANICAL

1/2 O2 SENSOR

(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT

(K299) O2 1/2 HEATER CONTROL CIRCUIT

(K904) O2 RETURN DOWNSTREAM CIRCUIT

FUEL CONTAMINATION
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Old 12-19-2010, 01:56 PM   #10
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Quote:
Originally Posted by Dogzilla View Post
Coincidence or not.....there's no way in hell that I'd ever go to "Fletchers" again!!

That is absolutely agreed by several of us!!!

I generally try to do most of my own stuff but got caught by a special on oil, filter and lube.
Won't fall for that again!
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Old 12-19-2010, 01:59 PM   #11
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Quote:
Originally Posted by computeruser View Post
From the interwebs:

P2096-DOWNSTREAM FUEL TRIM SYSTEM 1 LEAN

Set Condition:
If the PCM multiplies short term compensation by long term adaptive as well as a purge fuel multiplier and the result is below a certain value for a calibrated amount of time over two trips, a freeze frame is stored, the MIL illuminates and a trouble code is stored. Two Trip Fault. Three good trips to turn off the MIL.


Possible Causes

EXHAUST LEAK

ENGINE MECHANICAL

1/2 O2 SENSOR

(K141) O2 SENSOR 1/2 SIGNAL CIRCUIT

(K299) O2 1/2 HEATER CONTROL CIRCUIT

(K904) O2 RETURN DOWNSTREAM CIRCUIT

FUEL CONTAMINATION

Thanks The Jeep is still running great and never did show any problem. I have added about 12 gallons of 89 octane fuel so hope it clears the MIL.
Thanks again.
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Old 12-19-2010, 02:29 PM   #12
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Quote:
Originally Posted by Sonorasun View Post
Thanks The Jeep is still running great and never did show any problem. I have added about 12 gallons of 89 octane fuel so hope it clears the MIL.
Thanks again.
If it's an O2 sensor, it may not make a difference that you can tell. I've had a bad sensor (code 0161, I think) for >1 year and the Jeep still runs great, no change in fuel economy, etc. As you can likely guess, I'd be inclined to ignore the code (or clear it at some point and see if it comes back), until noticeable symptoms appear.
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Old 12-19-2010, 02:47 PM   #13
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Quote:
Originally Posted by Sonorasun View Post
Thanks The Jeep is still running great and never did show any problem. I have added about 12 gallons of 89 octane fuel so hope it clears the MIL.
Thanks again.


Putting in higher octane fuel in a vehicle that does not require it, is throwing money away. Octane is a measurement of the fuel's resistance to burn. Higher octane is necessary for example in high compression and forced induction engines and detonation could occur from the high pressures/temperatures. Your Wrangler is designed to run 87.
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Old 12-19-2010, 03:00 PM   #14
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Quote:
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Putting in higher octane fuel in a vehicle that does not require it, is throwing money away. Octane is a measurement of the fuel's resistance to burn. Higher octane is necessary for example in high compression and forced induction engines and detonation could occur from the high pressures/temperatures. Your Wrangler is designed to run 87.
Thanks Neil,
I have never had any problem with 87 and Jeep has always run just fine. Thought maybe the 89 might possibly (in some way) help clear or clean it. I wouldn't use it normally and appreciate the information.

Also, thanks computeruser. I will just run it like it is and hope the code goes away. May wind up putting tape over it if it bugs me to long.

Thanks again for all the input. It really does help to know where to go for great help and assistance.
Jim
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Old 12-19-2010, 03:01 PM   #15
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Quote:
Originally Posted by Sonorasun View Post
Thanks Neil,
I have never had any problem with 87 and Jeep has always run just fine. Thought maybe the 89 might possibly (in some way) help clear or clean it. I wouldn't use it normally and appreciate the information.

Also, thanks computeruser. I will just run it like it is and hope the code goes away. May wind up putting tape over it if it bugs me to long.

Thanks again for all the input. It really does help to know where to go for great help and assistance.
Jim
Give it enough time and you won't see it anymore. Kinda like a small stone chip in your windshield, once you get used to it...
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Old 12-19-2010, 03:18 PM   #16
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In NC, it's impossible to get our yearly inspection if that "check engine" light is on. And you can't get your liscense without an inspection.

I'll bet that "Fletchers" is spraying something into the airbox that trips the O2 sensor.
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Old 12-19-2010, 03:24 PM   #17
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Fletchers is running a $29.95 "Check Engine Light" special next week...
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Old 12-19-2010, 03:32 PM   #18
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Lol
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Old 12-19-2010, 03:44 PM   #19
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You can leave the battery disconnected overnight to clear the code and completely reset the computer.
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Old 12-19-2010, 03:48 PM   #20
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Really?? That's exactly what the OP and his friend should try. I feel certain that "Fletchers" did something to trigger the light.
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Old 12-19-2010, 04:30 PM   #21
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You can leave the battery disconnected overnight to clear the code and completely reset the computer.

Thanks!
Is there a specific time period for leaving it disconnected or just generally about 12 hours to reset? I seem to get overly anxious and miss time frames by not waiting long enough on most things.

And, I am betting that the shop will be expecting a lot of their customers to take advantage of the "check engine light special." LOL
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Old 12-19-2010, 04:37 PM   #22
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No specific time ... Few hours is more than enough. Even 4 hours would do it too.
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Old 12-19-2010, 04:37 PM   #23
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To just reset the codes, 2 minutes is enough.
To deep clean the memory it takes at least 8 hours.

Have a look underneath at the connectors for the O2 sensors. They may have knocked them loose or "accidentally" cut the wires to them.

This is the time of year those kinds of businesses get slow.

2 vehicles with the same problem after a simple oil change sure sounds suspicious.
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Old 12-19-2010, 09:04 PM   #24
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From working in the dealerships we tell the customers 15 minutes is plenty. No need to go over night. The code that your Jeep is throwing is a common code. My Jeep throws it from time to time and it goes away on its own or I clear it with my scan tool.
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Old 12-19-2010, 10:44 PM   #25
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Rubi 2 - maybe if you quit using "Hitler's Revenge" Bosch sensors and got real ones it wouldn't keep setting that code.

The code sets for a reason, not arbitrarily.

I think Bosch in German means "I'll be back" - a comeback.
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Old 12-20-2010, 01:52 PM   #26
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I re-connected my battery this morning and no codes. Everything looked just fine so went for a short ride. All is well!!

I did check all of the wiring and connections and did not find anything disconnected, unplugged or at all unusual. Apparently it was just the sensor.

Now, with the history of this shop, I do think they may have had something to do with the sensor activating. As some of you have mentioned, spraying something into the air intake or otherwise activating the sensor. It is so hard to find someone that does good work and too bad you can't trust people.

Thanks to all that responded. It is great to have such a resource available.
Happy Holidays!!
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Old 12-20-2010, 11:38 PM   #27
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After a long time reading w/o posting I have to now break the ice. I have had excellent service with our later model cars/trucks (currently 5 each) at Fletcher's in Tucson, both the Oracle Rd and now Tangerine Rd stores. As a mechanical engineer that started with motorized vehicles 47 years ago with a Cushman motor scooter I have some experience, doing all but the highly complex newer vehicle stuff myself. They have helped my wife and daughters when I was out of the country w/o any unusual charges and when they have screwed up admitted the mistake and did not charge us for the parts or work. I have no interest in Fletcher's other than their getting a fair shake. Sorry to hear that your Fletcher's have terrible management! Thanks
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Old 12-21-2010, 12:17 AM   #28
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Maybe they knew that you know your stuff .... Just sayin
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Old 12-21-2010, 01:00 AM   #29
Knows a couple things...

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No specific time ... Few hours is more than enough. Even 4 hours would do it too.
2 minutes will reset the codes.

Edit: Whoops RRich beat me to that.
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Old 12-21-2010, 01:30 AM   #30
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Originally Posted by Jerry Bransford
2 minutes will reset the codes.

Edit: Whoops RRich beat me to that.
Good to know ... I always learn something from you guys!! Thanks for sharing your knowledge guys!! Only few people can do that

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