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Hyundai Elantra P2626 and P0030 Fault Codes: O2 Sensor Heater Circuit Issues and Wiring Explanation

Model: Hyundai Elantra Fault Code: P0030 Posted: 2020-04-25 15:14

My 2008 Hyundai Elantra is displaying two diagnostic trouble codes: P2626 (O2 sensor pumping current trim circuit/open bank 1 sensor 1) and P0030 (generic O2 sensor heater control circuit fault for bank 1, sensor 1). I attempted to test the oxygen sensor but noticed it has five wires—blue, black, yellow, grey, and white. Can anyone confirm what each wire is responsible for? Is there a standard wiring configuration or pinout for this sensor?

Related fault codes

P0030P2626

Comments (3)

Anonymous 2020-04-25 19:06

You can verify the internal resistance of the sensor heater by measuring across two of its pins. The expected resistance should be between 3 and 4 ohms. While I don't have the exact pinout, larger gauge wire pairs—such as blue/black or black/grey—are likely to be the heater circuit. If the heater circuit reads open, the sensor must be replaced with an OEM-compatible unit.

Anonymous 2020-04-26 04:23

I'm looking for someone who can confirm which specific wire corresponds to what function on this five-wire oxygen sensor. Would randomly testing each wire potentially damage the sensor or wiring?

Anonymous 2020-04-26 09:53

With sensor disconnected you are measuring for resistance so not to cause damage. Try measuring across pins 4&5. Search for connector diagram, believe bottom two pins right to left. Let us know what you find.