Answers
Feb 09, 2024 - 02:08 PM
P300, P301, P302, P1128, and P401 suggests various issues. P300 - Random/Multiple Cylinder Misfire, P301 - Cylinder 1 Misfire, P302 - Cylinder 2 Misfire, P1128 - Closed Loop Fueling Not Achieved Bank 1, P401 - Insufficient EGR Flow. So, while a bad fuel pump may contribute to a lean condition (P1128), it's not typically linked to specific cylinder misfire codes (P300, P301, P302). Before considering a fuel pump replacement, check fuel pressure, inspect spark plugs and the ignition system, examine the air intake system for leaks, and assess the EGR system for potential clogs (P401). Ensure the recently replaced O2 sensor is correct and properly installed.
Feb 13, 2024 - 12:41 AM
Hey there!
The P1128 code usually points to an issue with the fuel-air mixture, not necessarily the fuel pump. It's more likely related to the Mass Air Flow (MAF) sensor or a vacuum leak. The P300, P301, and P302 are misfire codes, indicating a problem with specific cylinders, possibly spark plugs or ignition coils. The P401 code suggests an issue with the Exhaust Gas Recirculation (EGR) system. Replacing the O2 sensor was a good move, but since it still won't start, consider checking the MAF sensor, vacuum lines, spark plugs, and ignition coils. These are common culprits for the trouble codes you mentioned. If the problem persists, a deeper diagnosis might be needed.
Your friend may need some parts in the process, click this link to be directed to our website where the vehicle information has already been entered. Simply enter the part's name into the search field to get started.
Good luck with the troubleshooting!
The P1128 code usually points to an issue with the fuel-air mixture, not necessarily the fuel pump. It's more likely related to the Mass Air Flow (MAF) sensor or a vacuum leak. The P300, P301, and P302 are misfire codes, indicating a problem with specific cylinders, possibly spark plugs or ignition coils. The P401 code suggests an issue with the Exhaust Gas Recirculation (EGR) system. Replacing the O2 sensor was a good move, but since it still won't start, consider checking the MAF sensor, vacuum lines, spark plugs, and ignition coils. These are common culprits for the trouble codes you mentioned. If the problem persists, a deeper diagnosis might be needed.
Your friend may need some parts in the process, click this link to be directed to our website where the vehicle information has already been entered. Simply enter the part's name into the search field to get started.
Good luck with the troubleshooting!
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