I've been getting codes 17831, 17802 which are related to secondary air systems bank 1 and 2 along with a few misfire codes for cylinders 2 and 4 along with a camshaft position senor code . The car will shutter like it wants to stall with blinking CEL but after a minute or two it will smooth out and the light will stop blinking and the car runs fine.

This has been happening every two days, I clear the codes and then 2 days later I get CEL and shutter again.

I did notice I have a slight crack that is causing an exhaust leak with one of my flex pipes...could this be the reason for the CEL??

 

o2 sensors maybe? When was the last time you changed them?

 

I have a 120k and don't believe they have been changed but wouldn't a bad o2 sensor throw it's own code

 

Sometimes, but I've heard of them throwing misfire codes, camshaft position codes, all sorts of things.

I'm not an expert on the subject so I hope somebody else chimes in, but o2 sensor would be my guess.

 

I was thinking O2 Sensor/Cat as well.

Check for an upstream O2 code and see what you find.

Also check you combi valve vacuum hose and all other vacuum hoses (justy to be safe).

 

These are the codes , 17831,17802,16684,16688,16686,17819, I don't think any are related to O2. Any insight on these codes?

 

a couple insufficient flows and a bunch of misfires. My guess would be a vacuum leak or o2 sensor. You could have gunk in your injectors and just need some fuel system cleaner like I did. Could also be your coil pack.

Can't hurt to get a second diagnosis, but so far two of us have said the o2 sensors.

 

yeah but wouldn't a bad o2 sensor throw it's own code?

Also noticed the crack in my flex pipe is getting bigger and louder, you think an exhaust leak would throw these codes

 

if the crack is after the downstream o2 sensor it should just be a loud annoyance. If it's between the 2 upstream o2 sensors and the 1 downstream, it may have an affect.

Honestly I would give a good hard check for vacuum leaks using your favorite technique, and if you see/feel/hear none, I would think about changing both upstream o2 sensors. It's better to start cheap and work up during diagnosis, and o2 sensors aren't free, but they won't break the bank. Plus replacing them in general is a good idea every (however many) miles.

But like I said, if you're not comfortable with that and are positive they should be sending their own code instead of random others, by all means don't start throwing cash at the problem. Get a diagnosis from somebody else or a mechanic.

 

I think I found the problem, 17802 is an ignition issue with 2 and 4 clylinder. while car is idleing, I can pull the 2 n 4 wires and the idle doesn't change so I thing my ignition coil is shot. the car is running on 4 cylinders and the CEL is flashing all the time.

Is there an easy way to check the ICM on a 2.8 V6