Question about 1999 Jeep Wrangler

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My check engine light came on in my 1999 Jeep Wrangler. Can I get the code without a reader?

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If you have a digital odometer(mileage) you can access your OBD also known as the onboard diagnostic ll by turning your key to the on (NOT start) position WHILE holding in on your mileage/trip reset button. Your vehicle ID number may show up first by watching your tachometer needle point to numbers on your indicator panel. Then it will point to any codes. I believe this is a 3 part code then a pause. Example: Tach needle points to: 2 then 4 then 7 the code is 247. (PAUSE) if other codes come up it will do the next ones as well. Sometimes, you have to click your igntion key on and off 3 times then hold in on your trip reset button. This may or may not reveal all codes. I use a scan tool most of the time. Hope this helps. Good luck!

Posted on Jan 11, 2011

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Do you have a digital ododmeter on this model

Posted on Aug 31, 2010



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Posted on Jan 02, 2017

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SOURCE: Check Engine Light - Code numbers P1486 & P0455

Found on my jeep that the high quality vac line to the evap bottle had split on the under side.

Posted on Sep 03, 2008

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SOURCE: 1995 Jeep Wrangler 2.5L Fuel Pump/Check engine light

Could be one of several items...I'd check the fuel pump relay, auto shutdown relay and the ignition switch itself. I'd bet on it being one of those relays but, we all have been fooled at least once!!! I'd also make sure that body and engine grounding is good and clean. Relays can't work properly without a good ground.

Posted on Nov 03, 2009

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SOURCE: I have a 2003 jeep wrangler and this morning the

That code is related to an oxygen sensor failure (or wiring problem) Many times though the code is set by the sensor not because it has failed but because it is reading a mixture in the exhaust that is beyond its ability to read. Therefore, to avoid replacing the sensor and still having the same problem when you are finished it is essential that you check the remainder of the system paying close attentions to somewhat out of range items which aren't bad enough to set a code, but together, throw the control system off enough to cause a problem. Not only sensors need testing but the ignition coil, plug condition and vacuum system/vapor recovery need to be right in order for everything to be working correctly.(pretty much anything that can change how well the fuel is being used in the engine) I know it takes time and patience to do all this but that is what any competent shop will do so you are not back there the next day!!! Most testing can be done using a digital multi-meter and a haynes or chiltons manual as a guide reference. And of course, before you begin, do check the values of the O2 sensor as well.

Posted on Feb 25, 2010

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1999 Jeep Wrangler 4.0L cranks but will not start. No spark from coil. Replaced coil and crank sensor.

Check all your fuses, check power to your coil, I doubt the crank sensor was bad unless it threw an engine light at you. Ohm out your plug cables.

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Hope this help (remember comment and rated this post).

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1 Answer

Can I get the fault codes without using a reader?

You will have to use a "reader". All vehicles manufactured after 1995 are termed OBDII (Onboard Diagnostics II) and the diagnostics can only be accessed with a OBDII reader. Prior to 1996, OBDI vehicles could "flash" fault codes on the check engine light. The good news is that many retail auto parts stores will let you use their reader right in the parking lot!

Please do a little research on the codes you do find before you purchase a replacement part. The problem might be a bad connection to a sensor(s), worn sparkplug(s) / wire(s) or simply a dirty air cleaner.

Good luck, rhais.

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You need to do a code check. if no codes, check fuel supply (pump and filter) Quick way to isolate problem to either fuel or spark is to spray carb cleaner into intake while cranking. If engine starts, then it's fuel...If not, then I'd suspect spark...common problem there is crank sensor, but don't replace it without testing first!!!

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The reason you can't pull codes is that you have the "later" OBD system which can only be accessed with a scan tool.

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my 99 jeep wrangler has the same problem when I had it looked at they told me its a chrysler problem and there is nothing wrong and there is a short under the dash I had them reset the warning light for an emissions test but the light came back on in a few days. It was not worth the expense to try and find the short

Jan 09, 2009 | 1999 Jeep Wrangler

1 Answer

Check Engine Light - Code numbers P1486 & P0455

Found on my jeep that the high quality vac line to the evap bottle had split on the under side.

Aug 14, 2008 | 1999 Jeep Wrangler

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