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Hey guys, just found this website a few days ago and have learned so much. I recently had a 99 Civic Lx passed down to me and got the CEL on. I took it to Auto Zone to get the code and it was P0135 A/F Heater Circuit Malfunction 1.
Have looked around and it seems everyone says that its the pre cat o2 sensor. I wanted to save a little money and do it myself. I think I located it, but wanted to make sure. I added a pic, can you guys let me know if thats the sensor i should replace...and if you have any extra info to add i'd appreciate it.

Thanks
Jay
(pic is taken from right under the hood right in front of the engine)

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Rep Power: 217

You'll wanna invest in O2 sensor socket to remove it properly without damaging anything.

 
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yea that is the sensor u should let the car cool down and take the exhaust manafold heat shroud off then get the car hot and the sensor will come right out with it hot if not it might be a lil tight but buy a good O.E sensor like a bosh because if u buy a cheep universal one the check engine light will come right back on

 
Rep Power: 0

yea that is the sensor u should let the car cool down and take the exhaust manafold heat shroud off then get the car hot and the sensor will come right out with it hot if not it might be a lil tight but buy a good O.E sensor like a bosh because if u buy a cheep universal one the check engine light will come right back on