My Service Engine Soon light is on. It's code P0427 - Catalyst Temperature Sensor Low Input. Whats the fix?

Question

This is on a Nissan Xterra. The codes are universal, so what's the solution for this code? P0427 - Catalyst Temperature Sensor Low Input

Answer 1

Hi, I am an auto technician. I have not run across this particular code yet, and I did some quick research, but didn't come up with much. You didn't specify a year, but I'm guessing it's an 05 or newer. Going on your code description, this is going to be a seperate sensor, in or near the catalytic converter. This sensor would be monitoring the actual temperature in the converter(s). The powertrain control module (pcm) would use this kind of input to see if the catalyst is up to proper operating temperature, and functioning normally. A converter must be at a certain temperature to work efficiently. Newer model vehicles are starting to monitor this type of input to control emissions more effectively. As for the code... a "low" input could mean "low temperature input from the sensor to the pcm" or "no" input at all. This could mean that the sensor itself has failed, or there is a possible wiring issue between it and the pcm, or, less likely, but still possible... a bad converter or bad pcm. There may also be a "flash" (updated software for your pcm) available if this problem is more common. Some information that may be most helpful to you is that catalytic converters are warranteed from the factory for 80,000 - 100,000 miles, seperate from the normal vehicle warranty. This is a FEDERAL LAW, but not a lot of people know about it. Just a word of warning regarding aftermarket (universal, or cheapie) converters... especially concerning 96 &+ vehicles, a lot of these converters are NOT tested the same way factory units are, and therefore do not pass the stricter testing criteria of the pcm. These have a high rate of failures and returning check engine and service engine soon lights. I would recommend staying away from them. Your best bet is to locate a shop that specializes in driveability and diagnostics. They will take the time to diagnose the problem and explain your options. This will save a lot of potential headaches, and eliminate "throwing parts" at the problem. I would be interested to hear about the solution when you get it taken care of, if it's no bother, thanks. Good luck.

Answer 2

O2 sensors are in the PO1xx range. I doubt your cat. needs replaced. The sensor seems to have a problem and is sending a poor signal to the computer. It takes a testing instrument to know what is wrong.

Answer 3

means one of the front O2 sensors isn't heating up like its supposed to. Then to fix, is replace it. Good luck.

Answer 4

you need to replace the cat converter midas has a great aftermarket converter for about 200 dollars and the will also turn out the ck eng light