I need help. 07 Jeep Liberty Sport with 4 engine codes

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TwoTapper

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P0174, P0175, P0151, and P0152. P0174 and P0175 are both bank 2. I am not a mechanic, but I do have tools. What should I do before taking it to someone? It has a loss of power, and it misfires when I rev it around 3500rpm.
112k miles
3.7L
New catalytic converter 2k miles ago All new spark plugs around 4-5k miles ago
 

LibertyTC

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Diagnostic trouble codes listed here: https://www.jeepkj.com/threads/generic-chrysler-diagnostic-trouble-code-list.39860/
P0151 2/1 O2 Sensor Shorted to Ground
P0152 2/1 O2 Sensor Shorted to Voltage
P0174 2/1 Fuel System Lean
P0175 2/1 Fuel System Rich
Check electrical connections at 02 sensors.
You may just need to replace the 02 sensors, use NGK/NTK oxygen sensors, jeep will like those.
Don't have the 07 FSM, the 2006 is close to help you though. https://colorado4wheel.com/manuals/Jeep/KJ/2006-KJ-SM.pdf
 

sleazy rider

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Googling those codes indicate an issue with the upstream O2 sensors or the MAP. Since you’ve recently done the cat, I’d lean towards the O2 sensors. Use an OEM one.
 

sleazy rider

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Too high falutin’ for a Liberty. Plain old NGK coppers are what the pros around here highly recommend.
 

LibertyTC

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Yup KJ needs these.. will make it run great!
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