Codes p0135 p0155 and p1258

**buswwa** · 12-03-2008, 01:31 PM

Anyone know what those codes are? My nice new 9k 00 Z28 popped those on me today. Please help if you can. Thanks guys and gals.

**2001NBMZ28** · 12-03-2008, 01:58 PM

135 and 155 are the precat 02 heater circuits on each bank. 1258 is rare, engine coolant overtemperature - protective mode active, when the ECT sees above 270 degrees.

**buswwa** · 12-04-2008, 03:54 AM

Ok, so is that the o2 sensors? Also, 1258, could that be resultant from when the car overheated when I picked it up? Also, if those are not the o2's, what do I need to fix/replace? When my work pulled the codes they erased them from memory, and the light never came back on, so I think I should be good, right? As for the 1258, would that just lie dormant in there so when the codes were next pulled (if at the dealer) they would be able to see that the car overheated? Kind of like a black box for the car (to look for signs of what went wrong/abuse to void warranty) for the dealership? Thanks again for all the help.

**2001NBMZ28** · 12-04-2008, 06:52 AM

If the codes haven't come back on you're probably OK. You took care of the overheating issue and didn't drive it hot right? Most codes stay stored in history for 40 ignition cycles if it turns off by itself. Visit gearchatter.com and look up the codes for your year, it'll give the description/diagnostics.

**buswwa** · 12-04-2008, 09:51 AM

Originally Posted by 2001NBMZ28

If the codes haven't come back on you're probably OK. You took care of the overheating issue and didn't drive it hot right? Most codes stay stored in history for 40 ignition cycles if it turns off by itself. Visit gearchatter.com and look up the codes for your year, it'll give the description/diagnostics.

Awesome. Thank you for all the help. This why I love this site and have it as my homepage.