Alright i have been getting code 43. I have not ever noticed a diff. of performance but i could be wrong. When i start my car and start to drive it will not be on, soon or a later it will turn on and never go off. I get code 43 so i replaced my fuel filter and that did not do that. I dont notice a difference in power when it is on then off but i may just not notice it. My fuel pump works fine. I heard it could be the o2 sensor. I just put one on a few months ago but recently i had a timing problem and was shooting flames out of the exhaust so i dont know if that friend it Anyone got a quick and easy answer? THanks

 

if it is the o2 sensor, could that cause me to run rich and get black smoke up on the back of my car and at high rpm's? Thanks

 

Id say its the O2, did you get an OEM replacement? Did you rest the ECU after you installed the O2 to clear the code?

How do u know that ur timing is off? Did you play with the dizzy? Get the timing checked out first!!

 

My timing belt slipped and majorly screwed up the timing so i was burning richer then a jet airplane. I thought that could have fryed it. Ill get a new o2 sensor asap. Thanks

 

thats the same code i get but only if i get on it when the car is cold.

 

You should search. I have posted the answer to this question numerous times now, its the O2 sensor.

When the CEL Kicks in your car enters limp mode, ie. as rich as possible at all times. Get it checked and fixed.

 

Just so you know the answer that it is the 02 sensor is not always the right answer. It seems to be the most common reason for the code but its not always the problem.
anything that causes the o2 sensor to read incorrectly could cause the light to come on.
basically anything that could cause the vehicle to run too rich or too lean. Get a manual
and perform the tests first. Unfortunately I have the same code coming on and instead
of just doing the tests I started throwing parts at it. still have the code coming on. the o2 sensor was the first thing I replaced. My advice is test everything before replacing parts.