Need help about Oxygen sensor.
- Thread starter Boril
- Start date
- Car
- 09 FX50
do you mean if you replace your catalytic converters with test pipes? or just replace your catalytic converters? You need o2 sensors otherwise it will show a check engine light. You can simply get new ones, however.
- Car
- 2007 FX35 RWD
Replacing the stock cats with HFC's or test pipes could give you a check engine light if the downstream O2 sensor sees a different reading. You might need these to trick the sensor into reading within specs though: https://www.z1motorsports.com/350_g35/product_info.php?products_id=3736
It sounds like that is what you are asking.
It sounds like that is what you are asking.
Your car didn't originally come with test pipes, it came with catalytic converters. If you replace them with high flow test pipes, it may be fine and you will not get a check engine light if the new cats are close enough in efficiency to your old ones. But in order to make more power, the new high flow cats will do less "cleaning" and so if the material degrades at all, you may have a CEL pop up down the road. If you replace your OEM cats with test pipes, you are guaranteed to get a CEL unless you get one of the O2 extenders shown.
Basically pre-cat O2 sensor sends a reading, the post cat O2 sensor sends another reading to the ECU. If the voltages are within correct range, ECU thinks that the catalyst is working correctly. But if you get test pipes, the front O2 and rear O2 will read the exact same and the ECU will think that your cats have failed hence the CEL. Using the spacer may help with this as by moving the rear O2 out of the exhaust stream, it will won't "see" all of the exhaust gases and will show a different reading. This may trick the ECU into thinking the cats are still working, it's not guaranteed though.
Basically pre-cat O2 sensor sends a reading, the post cat O2 sensor sends another reading to the ECU. If the voltages are within correct range, ECU thinks that the catalyst is working correctly. But if you get test pipes, the front O2 and rear O2 will read the exact same and the ECU will think that your cats have failed hence the CEL. Using the spacer may help with this as by moving the rear O2 out of the exhaust stream, it will won't "see" all of the exhaust gases and will show a different reading. This may trick the ECU into thinking the cats are still working, it's not guaranteed though.
- Car
- 09 FX50
then no, you shouldn't have an issue as the 02 sensors are separate. Though if you are changing the cats you may as well put new o2 sensors in...