^ that reinforces what i stated earlier. most problems are related to poor install.

improper placement of sensor- must be a minimum of 24" away from the turbo outlet.

excessive heat will damage the sensor- if the temp of the pipe at the sensor is over 450 deg F then its too hot. you need to relocate it farther downstream or install the sensor with a heat sink.

Improper cable routing- cable routing can make a big difference due to radiated noise from the vehicles electrical system.

noisy electrical system- if you have a failing alternator that is putting out excessive a/c ripple voltage, poor grounds, or other failing electrical components it will feed noise into the system.

poor location for power- the fuse box and ignition harness tend to be very noisy on cars. connect directly to the battery with a relay.

poor ground location- same deal as cable routing. different areas of the car will be noisier than others. what looks like a good ground spot may be an electrically noisy area. do not use factory ground locations- those are usually the noisiest spots on the car.

poor connections- are you are soldering and shrink wrapping the connections ? butt connectors and t-taps are unacceptable no matter how good you crimp the connections.


i was a stereo installer for about 12 years, one of the biggest issues we would have when installing a system with mutiple components was radiated noise noise into the audio signal chain. moving an RCA cable as little at 12" can mean the difference between a nice clean sounding install vs one where you hear alternator whine. ground point differentials will drive you nuts when its factory ground point differentials casing the problem.

you can buy a cheap hand held battery powered am radio and use it to find noise in your electrical system.