Hi Everyone,
I am new to the forum. I failed my emission test. My check engine light is on and the error messages I gotwas:
1. P0135: O2 sensor heater circuit Bank 1 Senor 1,
2. P0302: cylinder 2 Misfire Cyl. 2 Or Random Misfire
3. P0304: Misfire Cyl. 4 Or Random Misfire
4. P1300: Multiple Cylinder Misfire Detected

I hadthe O2 Sensor on the bottom changed but the check engine light is still on.I amin the process of getting the top one changed.
The questionsI have are:
1. If I had theboth of the (top & bottom)02sensor changed do you think I need to changed the exhaust manifold since it has a crack in it?
2.Will I pass the emission test if the misfire is not fixed?

Any help would be greatly appreciated.

thanks,
Carla

 

welcome to the forum, changing both sensors will help, but are they factory stock or aftermarket. Also has the engine been tuned and oil and filters changed. misfire will not pass the smog. cracked manifold if the check person cannot see it, will pass. if the person can see it cracked, it will not pass. It is also dangerous to have a cracked manifold, creates monoxide and can enter the cabin.

 

I don't get the error messages for the missfires anymore. Hopefully this will do it and get me to pass the inspections. I am having someone change the sparks plugs and the upper 02 today. Will let you know if the light goes away. Thanks for your help.
Go to know about the cracked manifold. The car is old and it has about 253,897 miles on it already but it runs great otherwise.
Thanks again.

 

Thanks for the reply, hope you get even more milage from your honda.

 

Check engine light is gone and I pass my emission test. Thanks again.