lopez14

my check engine light is on so i went to oreillys and its throwing off 2 codes. p0135 which is something about the o2 censor and p0128 which is something about the coolant temp. My cat was off the car when i got it but i put it back on so could that be the reason for the o2 code? but what about the coolant code? whats that about?

T-Smac

P0135 is an issue with the heating element for the O2 sensor. Likely fault is the sensor itself, but it could be the wiring too (corrosion, short, spread terminals).

P0128 means the engine isn't reaching operating temperature. Check your coolant level. Could be low. Could be a fault with the ECT (engine coolant temp sensor), stuck open thermostat, cooling fans running too long, faulty IAT (intake air temperature sensor). My guess would be one of the first 3.

lopez14

Where is that o2 censor at? Is it the one on the cat?

s2000maniac

if it says bank 1 sensor 1 its on the header. if it says bank 1 sensor 2 then its on the cat. as far as coolant issue change your thermostat, that is most likely your problem.

T-Smac

The Code is for B1S1 so on the header.

lopez14

okay cool. do i have to special order the thermostat and o2 sensor online or at the dealer or can i just find them like at autozone or NAPA? also am I fine to be drving my car like that for now or am i harming it? thanks!