Answers
Nov 03, 2023 - 04:49 PM
The trouble codes you're seeing can help narrow down the issues:
- P0301 & P0307 indicate misfires on cylinders 1 and 7, respectively.
- P0430 indicates a problem with the catalytic converter efficiency for bank 2.
- P2097 suggests a post-catalytic converter fuel trim system too rich for bank 1.
Considering the misfire codes remained on cylinder #1 even after swapping coil packs, and you now have a misfire code on cylinder #7 after swapping, it suggests the problem followed the coil pack to cylinder #7. That could mean you have at least one faulty coil pack. If the misfires are still present on both cylinders after swapping back, there might be additional causes for the misfires such as spark plugs, fuel injectors, or even internal engine issues.
The P0430 code doesn't necessarily mean that the catalytic converter is bad; it could also be affected by the misfires or a bad oxygen sensor sending incorrect data.
For the P2097, this could be related to the misfires or could be a separate issue such as a leaky fuel injector causing a rich condition, a faulty O2 sensor, or an exhaust leak.
Before replacing the post-cat O2 sensor for bank 1, consider these steps:
1. **Confirm Coil Pack Function**: Use an inline spark tester to check for spark on cylinders 1 and 7 to ensure the issue isn't just the coil packs.
2. **Inspect Spark Plugs**: Although you've mentioned that plug #1 is not fouled, it's worth checking all related spark plugs for wear or damage.
3. **Fuel Injector Check**: Perform a fuel injector flow test and electrical test. A clogged or malfunctioning injector could cause a misfire.
4. **Compression Test**: If the misfires persist, a compression test will be useful to identify if the issue is internal to the engine.
5. **Oxygen Sensor and Fuel Trim Data**: Before replacing the post-cat O2 sensor, use a scan tool to observe the fuel trim values and the oxygen sensor readings to confirm they are out of spec.
6. **Check for Exhaust Leaks**: An exhaust leak, especially before the O2 sensor, could lead to incorrect readings and trigger the P0430 and P2097 codes.
After all these checks, if the evidence points to a faulty O2 sensor (consistent with the P2097 code), replacing it might be warranted. However, the flashing check engine light indicates a condition that is potentially damaging to the catalytic converter, like a misfire, so it's important to address the misfire codes promptly to avoid more costly repairs.
- P0301 & P0307 indicate misfires on cylinders 1 and 7, respectively.
- P0430 indicates a problem with the catalytic converter efficiency for bank 2.
- P2097 suggests a post-catalytic converter fuel trim system too rich for bank 1.
Considering the misfire codes remained on cylinder #1 even after swapping coil packs, and you now have a misfire code on cylinder #7 after swapping, it suggests the problem followed the coil pack to cylinder #7. That could mean you have at least one faulty coil pack. If the misfires are still present on both cylinders after swapping back, there might be additional causes for the misfires such as spark plugs, fuel injectors, or even internal engine issues.
The P0430 code doesn't necessarily mean that the catalytic converter is bad; it could also be affected by the misfires or a bad oxygen sensor sending incorrect data.
For the P2097, this could be related to the misfires or could be a separate issue such as a leaky fuel injector causing a rich condition, a faulty O2 sensor, or an exhaust leak.
Before replacing the post-cat O2 sensor for bank 1, consider these steps:
1. **Confirm Coil Pack Function**: Use an inline spark tester to check for spark on cylinders 1 and 7 to ensure the issue isn't just the coil packs.
2. **Inspect Spark Plugs**: Although you've mentioned that plug #1 is not fouled, it's worth checking all related spark plugs for wear or damage.
3. **Fuel Injector Check**: Perform a fuel injector flow test and electrical test. A clogged or malfunctioning injector could cause a misfire.
4. **Compression Test**: If the misfires persist, a compression test will be useful to identify if the issue is internal to the engine.
5. **Oxygen Sensor and Fuel Trim Data**: Before replacing the post-cat O2 sensor, use a scan tool to observe the fuel trim values and the oxygen sensor readings to confirm they are out of spec.
6. **Check for Exhaust Leaks**: An exhaust leak, especially before the O2 sensor, could lead to incorrect readings and trigger the P0430 and P2097 codes.
After all these checks, if the evidence points to a faulty O2 sensor (consistent with the P2097 code), replacing it might be warranted. However, the flashing check engine light indicates a condition that is potentially damaging to the catalytic converter, like a misfire, so it's important to address the misfire codes promptly to avoid more costly repairs.
Nov 05, 2023 - 09:34 AM
Hi there,
The trouble code P0301 are caused by faulty ignition coils, spark plugs, a defective spark plug wires. Other causes are fuel delivery issues. Please click this link for more information about it from our CarParts resource blog online.
The 2nd trouble code, P0430, points to a failing catalytic converter or a bad oxygen sensor (either the upstream or downstream location). Please click this link for more information about it from our CarParts resource blog online.
Our CarParts resource blog even has YouTube DIY videos about car parts issues and repair steps for people to see. I hope this helps much!
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