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Engine light coming on 2002 Jeep Liberty, have codes.

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Engine light coming on 2002 Jeep Liberty, have codes.
Submitted: 4 months ago.Category: Jeep
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Answered in 6 minutes by:
7/26/2017
Jeep Mechanic: Dan, Technician replied 4 months ago
Dan
Dan, Technician
Category: Jeep
Satisfied Customers: 24,758
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is ***** ***** I'm here to help get your problem solved.

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Jeep Mechanic: Dan, Technician replied 4 months ago

What are the codes you are getting? Thanks.

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Customer reply replied 4 months ago
Liberty Sports, 191,000 miles Codes P0420,P0206, P0205
Customer reply replied 4 months ago
Send me your thoughts, will talk if necessary
Jeep Mechanic: Dan, Technician replied 4 months ago

What engine do you have? Has anything been replaced? Thanks.

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Jeep Mechanic: Dan, Technician replied 4 months ago

Also, are you trying to fix yourself or want to know what to expect at a shop? Thanks.

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Customer reply replied 4 months ago
3.7 Changed plugs but was getting the P04200
Customer reply replied 4 months ago
I will fix unless out of my range
Jeep Mechanic: Dan, Technician replied 4 months ago

Give me a few minutes and I'll get all the info together for you, thanks.

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Customer reply replied 4 months ago
I need to go to Post Office, will be back in 45.
Jeep Mechanic: Dan, Technician replied 4 months ago

P0206 and P0205 means computer detected problem with wiring or injectors on cylinders 6 and 5. P0420 usually means the catalytic converter is failing but I'd start with the injector codes. I'd recommend replacing those two injectors then clear codes. If p0420 comes back you can try a catalytic converter clean out procedure by unplugging one of the ignition coils and holding rpm at 3000 rpm for 5 minutes then reset codes again. If code comes back again you will need to replace converter. Here are instructions to replace injector and firing order to help identify correct cylinders. Let me know if you have questions, thanks.

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https://www.dropbox.com/s/485hk556de3j0k6/j1.pdf?dl=0

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https://www.dropbox.com/s/jfmup8eltypqe07/j2.pdf?dl=0

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https://www.dropbox.com/s/dx8o0gzyz0tsbte/j3.pdf?dl=0

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Customer reply replied 4 months ago
I was getting the P0420 code along for a few months, what do you think about replace the converter. Making a rattling noise in that area.
Customer reply replied 4 months ago
Thanks, ***** *****
Jeep Mechanic: Dan, Technician replied 4 months ago

If it is making noise then I agree it probably needs to be replaced but that isn't making it run rough, that would only cause check engine light to come on. Let me know if you have more questions, thanks.

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Jeep Mechanic: Dan, Technician replied 3 months ago

Ever get it figured out? Please do not forget to rate answer. Thanks.

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Customer reply replied 3 months ago
The jeep has 3 converters, what one would change? I can clear codes and P0240 will come back and other codes don't come up for some time. Jeep runs good. Sorry for the delay, have a lot of irons in the fire.
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Dan
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