2G Need help fixing engine check light

[shadowdrag]

Ok, my car just threw out 3 codes today. P0400 (EGR flow faulty), P0136 (Downstream heated O2 sensor fault (Bank 1)), and P0325 (knock sensor circuit faulty)).

My biggest concern is, what meant by Downstream heated O2 sensor fault (Bank 1). Is this the secondary O2 or is it the first O2 into the housing. Does this mean that my O2 just took a crap? I thought that when O2 sensor goes bad, it will throw out a fuel trim code and car runs like crap. Anyways, my car runs very good and strong and has no boost leak at all.

Is my knock sensor going out too? I am planning on replacing both sensors but still don't think there is a need, since my car is running very well. I'm not too worried about the EGR because I read many threads and no one has found a fix to it other than DSMLink.

Thx

 

[luv2rallye]

It's the secondary (rear) O2 (after cat) which is only used for emissions. A bad 1st O2 will make the car run terrible but not the second (you only may fail an emissions test).

 

[freshlane]

^+1, also I would say, yes, your knock sensor took a crap also. Did you throw all these codes at once?

 

[shadowdrag]

^+1, also I would say, yes, your knock sensor took a crap also. Did you throw all these codes at once?

Yeah, these codes just came up like 2 days ago at the same time. So I guess I'll start ordering the knock sensor first.


Thanks

 

[Dream On]

I think the knock sensor code only comes up if the wiring is bad or it came unplugged. I would physically check the sensor for the leaking black goo to see if it's really bad before spending $50-$70 on a new one.

 

[shadowdrag]

I think the knock sensor code only comes up if the wiring is bad or it came unplugged. I would physically check the sensor for the leaking black goo to see if it's really bad before spending $50-$70 on a new one.

Ok, I'll do that first.

Thanks