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megan racing headers

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The Megan header come on the car when I bought the car just finished the exhuast on out.I had 1g eclipse an it had a eBay header an it was a real good header.but on this Megan header on car has an o2 sensor at bottom on left right before the down pipe an another spot on the right above the one on the left would the one on bottom be the downstream an the one on the right be the up stream?
 
The Megan header come on the car when I bought the car just finished the exhuast on out.I had 1g eclipse an it had a eBay header an it was a real good header.but on this Megan header on car has an o2 sensor at bottom on left right before the down pipe an another spot on the right above the one on the left would the one on bottom be the downstream an the one on the right be the up stream?
You're going to have to try harder at using better grammar and spelling if you want anyone to help you. It's too difficult to determine what you're trying to say.

The downstream O2 sensor is downstream of (after) the catalytic converter. This header may just have two O2 sensor bungs -- possibly one for the stock O2 sensor and one for a wideband O2 sensor.
 
VelocitàPaola;152781640 said:
The downstream O2 sensor is downstream of (after) the catalytic converter. This header may just have two O2 sensor bungs -- possibly one for the stock O2 sensor and one for a wideband O2 sensor.

This. I bet the seller just took it out before he sold the car, it probably needs to be pluged. Also any chech engine lights?
2GNT.com - PCM_Error_Codes
This will tell you what is wrong and why the check engine light is on.
 
Last edited by a moderator:
I think I understand. On your exhaust manifold there are two locations for two different styles of O2 sensor. The one furthest from the top most of the manifold is the O2 sensor housing your supposed to use, this is based on the 420a motor. The uppermost housing or location for another O2 sensor should have a metal cap screw. I got one and will post pictures if need be

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