P1202 code for cavalier, help

[merlin1977]

p1202 Gas Mass Sensor circuit low frequency. is this the death code for the gas mas sensor? can it be cleaned?

[Madspeed]

Re: P1202 code for cavalier, help

I know this is old but I found it during a google search on cng cavalier p1202. Information is really fun to locate. I happened to have another cavalier to use for donor parts and i can tell u for fact that this code does not mean 100% death for the mass gas sensor. now to become a real tech and diagnose the actual problem =)

[siai47]

Re: P1202 code for cavalier, help

Don't get too excited yet. If you can't clear it, try disconnecting the fuse marked "CNG" in the underhood fuse box for a few minutes. Re-install the fuse and see if it will start on CNG. It could be a bad GMS, however, the code is really telling you the sensor (for whatever reason) is not seeing any CNG passing by it to measure. It's possible the sensor wire has broken or is corroded. It's also possible that no gas is reaching the sensor due to lockout valve problems or regulator problems.

[Madspeed]

Re: P1202 code for cavalier, help

found the issue w most since this thread. hot wire cold solder joint. re solder problem solved most of the time. don't spend 400 or whatever on some BS fix it urself =)

[2002cavalier]

Re: P1202 code for cavalier, help

found the issue w most since this thread. hot wire cold solder joint. re solder problem solved most of the time. don't spend 400 or whatever on some BS fix it urself =)

Madspeed, where is bad solder joint? I am getting this same code on my cavalier and I would like to check it out before sending it in to get repaired.