I have a 98 dx and recently replaced the header with another d16y7 header which has the cat attached. It came with a used lower o2 sensor which i did not bother replacing. I reused my upper o2 sensor.
Swap was successful, no codes no nothing. I also changed my tires to 205/50/15s.
After that, I noticed my mpg dipped drastically from 36 highway to 30. Nothing else was changed and I recently went to Autozone to get the codes checked, none.
I have been driving the same way in terms of shifting and acceleration with no use of AC. Do you guys believe it could be one of the o2 sensors? I am contemplating replacing both of them as I read that they should be replaced every 100,000 miles. My car currently has 165,000.
I read also that it could be the fuel filter, but I am assuming otherwise due to this happening after my header swap.
What do you think?
Appreciate any feedback. Thanks.
Swap was successful, no codes no nothing. I also changed my tires to 205/50/15s.
After that, I noticed my mpg dipped drastically from 36 highway to 30. Nothing else was changed and I recently went to Autozone to get the codes checked, none.
I have been driving the same way in terms of shifting and acceleration with no use of AC. Do you guys believe it could be one of the o2 sensors? I am contemplating replacing both of them as I read that they should be replaced every 100,000 miles. My car currently has 165,000.
I read also that it could be the fuel filter, but I am assuming otherwise due to this happening after my header swap.
What do you think?
Appreciate any feedback. Thanks.