how many o2 senors does this car have on 2001 Hyundai Elantra

I had an o2 sensor a exhaust part repaired and the check engine light still comes back on . i need to have a emission test done on it and i can't while the check engine light is on . can you please help me out.

by in Milwaukee, WI on February 26, 2012
1 answer 1 comment
ANSWER by on February 26, 2012
There are two sensors a front and a rear.There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate Oxygen sensors are identified by bank and sensor position. Sensor 1 is always pre catalytic converter, sensor two is always post catalytic converter. If an engine is a 4 or 6 cylinder engine the whole engine is considered bank 1, if an engine is a V6, V8, V10....., the engine bank containing cylinder number 1 (first cylinder in the firing order) is considered Bank 1, the other bank is considered Bank 2. Interpretation Oxygen sensor designation B2S1 refers to Bank 2 Sensor 1, it will be the sensor on the engine side of the catalytic converter in bank two. Check this link to determine the cylinder that contains cylinder number 1.
COMMENT by on February 27, 2012
thanks so much I will try that. Connie

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