Question about 2002 Chrysler PT Cruiser

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2002 Chrysler PT cruiser has only 28,000 miles the engine light came on. I retrieved error codes p0134, p1684 and P1685. I found a list of the codes but no description. Can you tell me what these mean

The front oxygen sensor was replaced a couple weeks ago. Checked all fluids and the car is running great. I found a list of the codes but don't understand the code description. Can you tell me what these error codes are, one is to inform that the battery had been disconnected within the last 50 starts but I don't understand the other two. Thank you!

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  • joseph m fucci
    joseph m fucci Dec 07, 2014

    Hi Donna Stedman, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?



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Not all replacement O2 sensors are factory direct plug-in replacements. The rewiring job to fit a universal part to your original harness could be suspect even if the new sensor is fine. I don't see anything to worry about at this point. The codes all seem to be related directly to the repair (inoperable O2 sensor, battery disconnected, bad key). They should go away by themselves over time, but you can hasten the troubleshooting process by erasing the codes from memory. All that takes is a couple of seconds and it can be done with most code scanners. If the codes return afterwards, then you will need to consult with your mechanic.

Posted on Dec 07, 2014

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I found the codes & basic (VERY basic) descriptions from these sources:

Code P0134 O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) - something to do with the O2 sensor circuit, but beyond that I'm not sure.

Code P1685 Skim Invalid Key - Security system issue. I got this answer from the Dodge Forum:

"The Sentry Key Immobilizer Module (SKIM) is part of the security system and kills the vehicle when a wrong key is used. There may be a problem with your key or the chip reader in the ignition switch. This is something the dealer will need to determine for sure. This code will also be set if someone actually tried to steal the vehicle."

Hope this helps.

Posted on Dec 07, 2014


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Posted on Jan 02, 2017

SOURCE: Engine code P1684

P1684 is not a factory diagnostic code, rather a code to identify last disconnect. Factory computers can identify start counts but OTC scanners cannot. The code prevents someone from disconnecting the battery (which clears many codes) and then reconnecting and having it tested. There is no way I can think of to selectively write more starts than the computer sees into the PCM so as to correct this. I can only think that after about 50 trips, it should be good. BTW, this code would have nothing to do with the emissions on the vehicle. I would suggest driving a few weeks so the computer will (hopefully) recognize the failure again and set more faults. The codes generated by these faults will assist in correcting what is actually wrong with the vehicle.

Posted on Jun 20, 2008

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SOURCE: My Engine service Icon comes on and stays on when I start my car?

I disconnected the batterie for 5 min to clear computer..
Light has gone out ?
If light comes back on I presume I have a slight leak in one of the pressure hoses..I will go through all suggestions cant afford big bills from Chrysler???want to fix this myself
Two yers ago this light came on and I took it to Chrysler they did a Carbon clean-up $400 later it has been fine since but dont think it needs this again I use "Plus" gas and only drive local ...
So wish me luck ...Mike

Posted on Sep 28, 2008

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SOURCE: code p1684 2002 chrysler

P1684 means the battery was disconnected within the last 50 key starts.

Posted on Feb 23, 2009

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SOURCE: 2002 dodge stratus engine light on p1684

Check and clean batery cables terminal. And drive it for about 60 milles and see if it fix.

Posted on Nov 23, 2011

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1 Answer

Chrystler 1999 300 m codes p1684 p0340 p1685 mean

P1684 CHRYSLER - Battery Power To Module Disconnected

P0340 CHRYSLER - Camshaft Position Sensor Circuit Bank 1 Sensor 1

P1685 CHRYSLER - Invalid SKIM Key

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1 Answer

What is error code P1685

P1685-invalid skim key-that means the key wheather its new or old is not programned to the car you cant just get any key cut it needs to be a skim chipped key and must be programed by a chrysler dealer to the car's skim module

Apr 07, 2014 | 2001 Chrysler PT Cruiser

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My 2002 pt cruiser died while I was driving first the oil light came on then it just died! I just had the oil changed 3 days prior to it dying some of the codes I received were 0340 1684 1685...

P0340 is cam position sensor. P1685 is for the key(has a chip in it) P1684 is battery has been disconnected. If the engine will still crank then codes P1684 & P1685 are probably old codes. So if the car will still crank, lets forget about those codes and focus on P0340 A bad cam position sensor will cause the engine to die and not allow it to start back up. Replace the cam position sensor and clear the code and the car should start up.

Oct 16, 2012 | Cars & Trucks

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We change the computer in our 2002 and there are 2 codes showing on the screen. P1684 & P1685

Code 1684 says the computer has lost battery voltage in the last 50 starts, and code 1685 means the security code in the key is not valid.
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Aug 17, 2012 | 2002 Chrysler PT Cruiser

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Errors P1684 given, how do I fix

The first code, p1684, just states the battery has been dis-connected in the last 50 start cycles.
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Have your mechanic take a look at those, and please let me know how it goes.

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Change the coil pack if your getting No spark.Or the crankshaft sensor.

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Dose anyone no wat thease codes codes meen as my car wont start but turning the key on an of a few times it brings up thease codes p1130 and p1685

P1130 - HO2S Circuit Low Variance Bank 1 Sensor 1

P1685 - Skim Invalid Key - The engine controller has received an invalid key from the SKIM.

CLICK HERE for a full list of OBD Codes for the PT Cruiser.

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Mar 05, 2009 | 2004 Chrysler PT Cruiser

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