Official Check Engine Light (CEL) thread

[soon179]

Hi I am new here .I have a 2004 Elantra gls and after rebuilding the tranny its still alive at 190K .Today my CEL came on for no apparent reason .I went to Auto zone and got these 3 Codes(I looked them up online as auto zone did not have my make and models codes)

P0030- Heated oxygen sensor (HO2S) 1, bank 1, heater control – circuit malfunction Wiring, HO2S, ECM
P2626- O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)
P2271 02 Sensor Signal Stuck

The only electric problems I have had with my car is the door being able to lock with the key left in the ignation(something that the car prevented before) and my autolocks only sometimes working/I aslo seem to burn out headlights brake lights often.Could these have to due with these codes? Thanks in advance for any help.

[airsoftfreak]

My car threw a po445 today any ideas? I've heard it was the gas cap, also I did a search and I saw that it may be the canister close valve, but my car fills up with gas just fine, and I replaced the valve underneath the throttle body not too long ago.

[Mikey]

My light has been on. Hooked up the reader and I get a big fat N/A for the fault...I'll clear it out and it stays off for a few hours to a few days, but all subsequent rescans come back with the same N/A fault. The engine is running okay so I'm at a loss. Anybody else have such a non-descript issue?

[songee623]

try pulling the - on the battery step on the brake for 30sec, then hook back up and see if that does the trick.