My "Check Engine" light came on today. The scanner at AutoZone reported one code.

P0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

Can anyone tell me which O2 sensor this is and where it's located?

Thanks in advance.

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1998 E320 120K mi
1991 Miata 80K mi
2001 Ranger 109K mi

That car has 4 O2 sensors. Bank 1 is the RIGHT side of the engine.
So bank 1 sensor 2 refers to the right rear sensor, MB number 000-540-81-17. Bosch short number 13-782, long number 0-258-003-782

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M.B. DOC, thanks for the reply.

While waiting for the oxygen sensor to arrive (from Fastlane of course), the check engine light turned itself off. Considering I now have the part, should I go ahead and replace the sensor anyway?

Once again, I getting the temptation to buy a OBDII scanner.

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1998 E320 120K mi
1991 Miata 80K mi
2001 Ranger 109K mi