Hello friends,
I have owned my 2000 C5 for 4 years and I’ve had 2 recurring issues. I’ve had my knock sensors go bad 4 times now and I’ve had my air system go bad 3 times. The first 2 times I had my knock sensors go bad I had neglected to change the valley cover gasket and then I had a mechanic do it for the 3rd time and he changed the valley cover gasket. Then they went bad again and I used the Napa knock sensors and torqued them to spec and now one of them is bad (all prior times both sensors would fail together) originally they would say low voltage and now it says “knock/combustion vibration sensor 2 circuit low bank 2” so maybe 1 of the Napa ones worked but the other didn’t? And the air system code is just “air system A” so I’m not sure what to do about that one either.

any and all help is appreciated I just want my car back.

thanks for your time,
-Will

 

As far as the P0410 it can be any component in the system or a wiring issue…when you start the car in the morning do you hear the AIR pump run for 20 seconds or so and then shut off ??…if not you can focus on the pump or maybe swap out the relay…so it can be a bad pump, bad shut off valve, bad vacuum line or bad solenoid…with a bidirectional scan tool it makes it a little easier to diagnose the system since you can turn the pump on and also activate the solenoid…as far as the #2 knock sensor it can be a bad sensor or wiring or even a bad PCM…you may want to check the terminal at the PCM by removing the appropriate connector (C1 or C2) and make sure there is no corrosion or the like at the PCM…I can’t remember if there is a bias voltage on the knock sensor wiring circuit so maybe someone can chime in that might know definitively…on some circuits the PCM sends out a 5 volt bias so the PCM knows if the circuit maybe have an open or short in it…the wheel speed sensor is one where you’ll find the bias voltage which also helps in troubleshooting…I don’t know if you have any “skill” in electrical diagnosis so I’ll just stop here.

 

Below is the criteria which sets that DTC…with a bidirectional scan tool you can actually activate the AIR system and watch the O2 sensor voltage drop below 222 mV verifying the system is operating correctly.

 

As you can see here the rear knock sensor is the light blue wire on terminal 11 and is on the C1 connector.