Hi, anyone know if the header have air leak and will it cause the CEL of the O2 sensor? Thanks!

 

Bump

 

no it shouldnt.. get a new sensor and or check your wiring.. could be shorted out somwhere

 

I already changed a new O2 sensor (Denso) but the CEL still on!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG-HK &raquo;</TD></TR><TR><TD CLASS="quote">I already changed a new O2 sensor (Denso) but the CEL still on! </TD></TR></TABLE>
Have you reset the ECU by unplugging the battery, or at least pulling the fuse for the ECU? Check Engine Light's wont turn off right away ( in some cases ) unless you reset the ECU.

An exhaust leak, unless it is very bad, should not cause you to throw a check engine light. If your exhaust leak were to be that severe, (speaking as if it were worst case scenario) it may throw off the sensor's reading to the ECU, causing it to throw a CEL, thinking something has gone wrong.

What year car is this by the way? Keep in mind 1996 and up use 2 oxygen sensors, one primary, the other for monitoring the catalytic converter.

 

All the things you said I did!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EG-HK &raquo;</TD></TR><TR><TD CLASS="quote">All the things you said I did! </TD></TR></TABLE>

Have you checked to see if its still the code for the Oxygen sensor? By coincidence you may be throwing another code for something that may not be related.

 

It is a fast flash with only every one time and carry on so I think it should be CODE 1!