During inspection I found out that a o2 sensor was bad but i was reading up on them and aparently there are four o2 sensors. 2 upper and 2 lower. How am i suppose to know what one is bad? secondly my Jeep's been starting rough every once in a while and my check engine light will blink which means the catalytic converter is damaged. I don't even know where to start because i believe there are two converters as well. . . Do these problems tie in together what should I do where do i begin?

Will try to send you to help free. with the check engine light on,take it to autozone or advance auto. tell them you need you car coderead,this will only work with the check engine light on.if it;s a bad o2 sensor they can tell you which one by code reading the computer in the car. it will say bank one o2 sensor bad or bank 2 and so on. all this help is free and they have nothing to gain by lying,however,if you fell like they are being untruthfull,simply take your car to another auto parts store and have them do the same code reading test to be sure.just because the check engine light blinks does'nt mean it's a covertor problem.it may be a simple repair that you need.a sensor may be going bad,but you won't know for sure until it's been code read, you could spend a fortune replacing 02 sensors for $75.00 a peice and it be something very simple.i do agree there are some people that take advantage of women,that's why i'm suggeting you try this before you rely on someone you have doubt with. hope this helps,if you need further assistance please repost your question and thank you for choosing fixya.com

The check engine light is blinking usually because of a misfire which can cause damage to the cat. The blinking check engine light does not necessarily mean the the cat is damaged.

The first thing you need to do is find out what codes are causing the check engine light to come on. If there is an O2 code it will help you identify the O2 sensor. The sensors are divided into to banks. Bank one is the same side of the motor as the number one cylinder. Bank 2 is the other side of the motor. Then they are divided into sensor 1 and senor 2. Sensor 1 is always before the cat. Sensor 2 is always after the cat. So if you had an O2 code for the Bank 2 sensor 1 O2 sensor it would be the opposite side of the engine from the number one cylinder and the sensor before the cat.

IMO, your first priority should be to figure out why the engine is misfiring and causing the check engine light to blink. Solving that first may take care of the O2 issues or the O2 could be the issue.

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