I have the current codes on a 2004 disco. p0130 p0174 p0150 p0171 p0101 p0327
I have installed new Bosch o2 sensors , new maf sensor, new 8mm plug wires, new double platinum plugs, new injectors and new coil packs. I have searched for a vacuum leak and could not find one. There are no exhaust leaks. I cleaned all of the electric plugs I could find. Help please!

 

Did the codes happen before or after you did the installation?

 

Both. The codes started after I had a leak at the radiator overflow tank. That was months ago.

 

All O2 sensors were replaced?

 

Yes. All Bosch. All parts were purchased from Rock auto with the exception of the plug wires. They came from Utah. The maf sensor was a cardone

 

Ok. Hard to believe all those parts would be bad out of the box. Seems to me you might have a common electrical/fuse problem as an underlying problem. Let's see if @Extinct @Sixpack577 @Best4x4 or @XRAD might have more detail. I just a noob trying to learn but the electrical stuff is outside my experience.

 

I have checked all of the fuses, none are blown. Checked the passenger side o2 plug with a volt meter and getting 12 volts there. I am stumped because I get close to 24 volts on two of the other wires in the o2 plug.

 

Even though we deal with these alot, I doubt most of us have the codes memorized. Good idea to post the reasons for each code in a list format like this:

1. Code #1 - explanation
2. Code #2 - etc.

That said, there are several places to start given the parts you replaced. Bosch sensors are known to come out of the box bad. The oxygen sensors have 4 wires, two for a simple resistance heater circuit, two for the output voltage from the sensor. The rave shows the wire colors.

You should get a low cost elm327 off of Amazon to use with the torque app on Android. The app will chart oxygen sensor voltage. It should be near 1 volt on startup, then start cycling as the engine warms up. If it does not do that, we need to know how it differs from that profile.

 

@fitzpafd … Do you have SAI?

 

Yes it has SAI