Running Lean

[willisk]

We recently bought a 2001 Saleen S281SC and it has these error codes:

P0136 Downstream Heated Oxygen Sensor circuit fault - Bank No. 1.
P0156 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2.
P1406 Differential Pressure Feedback Electronic Sensor circuit Downstream Hose.
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2.
P0171 System Too Lean - Bank No. 1.
P0174 System Too Lean - Bank No. 2.

The seller claims that the gasket he ordered should fix it and that it will be an easy install. Our mechanic tells a different story. Also, since we are in the state of CA, the seller was supposed to be responsible for smog certification, but because of the CEL, we cannot even do that.

Our mechanic said we would need to have several gaskets around the supercharger replaced, at the throttle body, intake manifold. It's a mess. On top of that, we need to have the oxygen sensors replaced and find out why coolant is leaking. Do you guys have any advice? Any help is greatly appreciated. Thanks in advance.

EDIT: Also, the idle rises and falls over and over when it is stopped. Is that the IAC? That's really strange to me, the car only has 9000 miles and it's carfax and autocheck are clean.

 

[blkhorse]

sensor 1 or 2? make sure they are plugged in for one and if they are sensor 2, do you have an o/r pipe with mil elim.? long tubes?

 

[willisk]

As far as I know, the car is stock Saleen. So i'm guessing no MIL elim. How do I check if it is sensor 1 or 2, and if they are plugged in?

(as you can tell, I am very new to this)

 

[squeak93]

Sensor 1 is the one closest to the header. 2, obviously the one farther down the pipe.

P0136 Downstream Heated Oxygen Sensor circuit fault - Bank No. 1. Needs mils
P0156 Downstream Heated Oxygen Sensor circuit fault - Bank No. 2. needs mils
P1406 Differential Pressure Feedback Electronic Sensor circuit Downstream Hose. needs mils
P1131 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1. Vac leak (bad gasket could cause this)
P1151 Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 2. vac leak.
P0171 System Too Lean - Bank No. 1. vac leak
P0174 System Too Lean - Bank No. 2. vac leak


Since its saying the heated switch is bad, youg hego (ground strap) that is in the fuel injector harnes may not have a good ground either. So might want to check that. It should be grounded to a rear bolt on the intake manifold.


See my answers to the right of the code.....


Edit: The lean codes could be caused by multiple things but start with the "gasket" the o/o is telling you about. It could also be a vac line leaking, exhaust leak, bad pcv valve, maf problem and so on.

 

[willisk]

First of all, thanks for the advice. Stangnet absolutely rocks. Within minutes of posting my question i get a response.

As for the mils, I'll order one. Is it a difficult install?

On another note, I had a different mechanic look at it today, and he cleared the error codes. So far, they haven't come back on. When they do come back on, he can see which codes came back up and go from there. After we get the gasket, he wants to do a smoke test to see where the leaks are. Will that detect vacuum leaks as well?

 

[hotcobra03]

thier is a 20amp fuse for o2 heaters..you can check that..

the 1409 is ..the tube going from egr valve to driverside exhaust manifold,has 2 vacuum hoses that run to the dpfegr sensor,vacuum hose is off ,or crack on tube?