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Eric, Automotive Repair Shop Manager
Category: Chrysler
Satisfied Customers: 32567
Experience:  20+ years experience as automotive store manager and technician.
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2006 chysler pacifica 3,5L oxygen senor and cataylist senor,

Customer Question

2006 chysler pacifica 3,5L oxygen senor and cataylist senor, no reading?
Submitted: 1 year ago.
Category: Chrysler
Expert:  Eric replied 1 year ago.


Do you mean the O2 sensor monitor and catalyst monitors are not showing as being ready during emission testing?

Is the check engine light on?

Customer: replied 1 year ago.
check engine light is on, 02 sensor and catalyst monitor are the 2 sensors to help you understand. I live in Virginia--my daughter owns the Chrysler lives in north Carolina. There you have to have a state safety inspection & emissions control test. It failed the test. The mechanic told her the O2 sensor & catylast sensor were not recording.I find it strange that two sensors would fail at the same time or would have bad connections or wiring at the same time. She did have valve work done on the engine. Could there be some other reason the sensors are not reading ?
Expert:  Eric replied 1 year ago.


Ok, what the mechanic is referring to is system monitors for the O2 sensor and catalytic converter. They are not reading as ready. This happens automatically if the check engine light is on. It doesnt always mean that either the O2 sensor or converter are bad. It just means that the systems wont complete their cycle to set as ready due to the check engine light being on.

We need to know why the check engine light is on at this point. There are over 500 causes of the check engine light being tripped by the computer. So the computer needs to be scanned for fault codes which will tell us the area of concern.

Do you know if your daughter had that done yet, and if so, what are the fault codes? They will be Pxxxx codes - example - P0420

Expert:  Eric replied 1 year ago.

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