code P0304 + MAF Sensor and O2 Sensor questions
10-27-2015, 07:04 PM
#1
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Thread Starter
Join Date: Apr 2012
Posts: 7
code P0304 + MAF Sensor and O2 Sensor questions
I was getting an intermittent check engine light that would turn on for a month and then turn off for a month. The error code was related to the mass airflow sensor, but shortly after I read it, it turned off and never came on again.
Now, three months later, the light came on again, but now it's P0304, which means Cylinder 4 Misfire Detected, but could be caused by a number of things. I've had the car since 170,000 and now I'm at 210,000, so I'm guessing the O2 sensors have not been replaced in +100,000 miles. Is this something I should replace either way? I've heard that it should be done this to increase fuel mileage and performance. I think I have a California car, since I bought the car from the original owner in California, but I would like to avoid spending money on replacements for all 4 of them, so should I replace all 4 of the O2 sensors, or just the two before the catalytic converter?
Also, is there a test I can do to determine that the MAF is working correctly? Any idea why it suddenly stopped causing problems? Is the MAF also something that should be replaced at regular intervals?
Finally, any advice on how to troubleshoot the P0304 code?
Now, three months later, the light came on again, but now it's P0304, which means Cylinder 4 Misfire Detected, but could be caused by a number of things. I've had the car since 170,000 and now I'm at 210,000, so I'm guessing the O2 sensors have not been replaced in +100,000 miles. Is this something I should replace either way? I've heard that it should be done this to increase fuel mileage and performance. I think I have a California car, since I bought the car from the original owner in California, but I would like to avoid spending money on replacements for all 4 of them, so should I replace all 4 of the O2 sensors, or just the two before the catalytic converter?
Also, is there a test I can do to determine that the MAF is working correctly? Any idea why it suddenly stopped causing problems? Is the MAF also something that should be replaced at regular intervals?
Finally, any advice on how to troubleshoot the P0304 code?
10-27-2015, 07:59 PM
#2
Member
Join Date: Jun 2015
Posts: 249
I was getting an intermittent check engine light that would turn on for a month and then turn off for a month. The error code was related to the mass airflow sensor, but shortly after I read it, it turned off and never came on again.
Now, three months later, the light came on again, but now it's P0304, which means Cylinder 4 Misfire Detected, but could be caused by a number of things. I've had the car since 170,000 and now I'm at 210,000, so I'm guessing the O2 sensors have not been replaced in +100,000 miles. Is this something I should replace either way? I've heard that it should be done this to increase fuel mileage and performance. I think I have a California car, since I bought the car from the original owner in California, but I would like to avoid spending money on replacements for all 4 of them, so should I replace all 4 of the O2 sensors, or just the two before the catalytic converter?
Also, is there a test I can do to determine that the MAF is working correctly? Any idea why it suddenly stopped causing problems? Is the MAF also something that should be replaced at regular intervals?
Finally, any advice on how to troubleshoot the P0304 code?
Now, three months later, the light came on again, but now it's P0304, which means Cylinder 4 Misfire Detected, but could be caused by a number of things. I've had the car since 170,000 and now I'm at 210,000, so I'm guessing the O2 sensors have not been replaced in +100,000 miles. Is this something I should replace either way? I've heard that it should be done this to increase fuel mileage and performance. I think I have a California car, since I bought the car from the original owner in California, but I would like to avoid spending money on replacements for all 4 of them, so should I replace all 4 of the O2 sensors, or just the two before the catalytic converter?
Also, is there a test I can do to determine that the MAF is working correctly? Any idea why it suddenly stopped causing problems? Is the MAF also something that should be replaced at regular intervals?
Finally, any advice on how to troubleshoot the P0304 code?
10-29-2015, 09:58 AM
#4
Senior Member
Join Date: Oct 2012
Location: Portland, Oregon
Posts: 2,979
How did you go about checking the health of the coil and spark plugs? The most likely causes are coil, spark plug, injector. Jerrod99 s suggestions are correct. Please do not assume the problem is something else. You will go on a frustrating wild goose chase. The oxygen sensors will throw a code when they are nearly done. I replace both at the same time. Usually at the same time as an oil change. The Maf is not replaced until it fails. Re-soldering the contacts inside it is certainly worth a try.
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