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This is 2003 Caddy CTS. I have ONStar and my check engine light was so they checked my DTC and found the following code problems.

PO153=HO2S Slow Response
PO158=HO2S Circuit High Voltage
PO169=HO2S Circuit Insufficient Activity
PO161=HO2S Heater Performance
PO2099=Post Catalist Fuel Trim System High Limit

I can't find any info on what all these codes mean for repair purposes or not. I called a couple dealers but they won't tell me anything on the phone I need to bring my car in. The ONStar tech didn't really say these items needed repaired or replaced. Can anyone help?

I thank you in advance.

John B.

Vehicle: 2003-Cadillac-CTS 3.5

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P0153 CADILLAC - O2 Sensor Circuit Slow Response Bank 2 Sensor 1

Read more: https://www.autocodes.com/p0153_cadillac.html

P0158 CADILLAC - O2 Sensor Circuit High Voltage Bank 2 Sensor 2

Read more: https://www.autocodes.com/p0158_cadillac.html

P0161 CADILLAC - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 2

Read more: https://www.autocodes.com/p0161_cadillac.html

Don't have any information for the P0169 or O02099, the rest of the sensor are replaced to the O2 sensor. You should start by replacing the front and rear O2 sensor on the bank 2.

 

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