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Code p0420. Runs fine, mileage may be down some. P0420

Customer Question
Runs fine, mileage may...

Runs fine, mileage may be down some

Mechanic's Assistant: What is the model/year of your Jeep?

P0420 catalytic converter efficiency down 2007 compass

Mechanic's Assistant: Are you fixing your Compass yourself? What have you tried so far?

Have not replaced anything yet it won't let me clear the code

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Checked exhaust back pressure at o2 1, was only 1 psi

Submitted: 4 months ago.Category: Jeep
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Answered in 1 minute by:
1/7/2018
Jeep Mechanic: eauto, The Car Guy replied 4 months ago
eauto
eauto, The Car Guy
Category: Jeep
Satisfied Customers: 17,058
Experience: ase mechanic 16 Plus years in the field
Verified

Hi . Thank you for asking your question on JustAnswer.
is the converter running hot?

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Chris
Chris
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