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2007 Ford Fusion P2258 Code: Causes, Diagnosis, and Parts to Replace

Model: 2007 Ford Fusion Fault Code: P2258 Posted: 2014-04-06 13:40

I'm new to car diagnostics, so please forgive any technical oversights. I recently encountered a Check Engine Light with code P2258 on my 2007 Ford Fusion, and I'm seeking clear, accurate guidance on what this means and how to fix it. The P2258 code indicates a 'Secondary Air Injection System Monitor Circuit High' — the Engine Control Module (ECM) commanded the air pump to turn off, but detected that the pump was still running. This suggests an issue in the electrical circuit or components of the secondary air injection system. I've read about related codes like P0410 and P0412, which pertain to the secondary air injection system, but I'm specifically looking for information on how to diagnose and repair the P2258 code independently. Background: - My car had a cooling fan assembly replaced just a month ago due to a blown fuse. The fan is part of an integrated assembly, which made replacement costly. - After that service, I began experiencing intermittent starting issues — the car would not turn over at times, requiring a jump start to get it running. - Once started, the airbag light remained on continuously during operation. - The wrench light flashed briefly and then turned off. The check engine light appeared around the same time as the wrench light. - I visited Advanced Auto Parts for code reading (P2258) — battery testing showed 12.96V initially, but dropped to 10.5V two days later. The shop diagnosed a blown cell and recommended a new battery. After replacing the battery and ensuring all connections are clean and tight, the car has started reliably and passed emissions testing. However, I'm still curious about whether P2258 was actually caused by the secondary air system or if it was a false reading triggered by the low battery. My questions: 1. What is the most likely component causing a P2258 code in a 2007 Ford Fusion? 2. Should I replace just the relay, solenoid, pump, or valve? Is there a specific part for only the sensor/relay? 3. Does Ford recommend replacing both the air pump and valve when any issue occurs with the secondary air system? 4. If the problem is electrical (e.g., a stuck relay or grounded wire), can I fix it without replacing the entire air pump or valve assembly? I understand that the secondary air injection system includes an air pump, solenoid valve, and associated wiring. From research, I believe the issue may start with the relay or control circuit — but I'm unsure how to verify this myself. Any detailed troubleshooting steps (e.g., checking for grounded wires, testing relay function) would be greatly appreciated. Also, if there's a part that can replace just the faulty sensor/relay without replacing the pump or valve, that would save significant costs. Thank you in advance for any insights or guidance!

Related fault codes
P2258
Comments (7)
Anonymous 2014-04-06 14:03

While I can't provide specific details on P2258, if your original battery is still in place, consider replacing it and cleaning/tightening the battery terminals. A weak battery can cause no-start issues and may trigger false engine light codes.

Anonymous 2014-04-06 14:09

P2258 — Secondary Air Injection System Monitor Circuit High: The ECM commanded the air pump to turn off, but detected it was still running. Start by checking the AIR relay. Then inspect for a grounded signal wire in the circuit. If your owner's manual doesn't show the relay location, please post that detail for further guidance.

Anonymous 2014-04-07 13:16

I agree with the above — I suspect P2258 was triggered by an electrical issue related to the secondary air system. The battery drain I experienced likely stemmed from this system's high current draw. My main question now is: if the problem is at the relay, what specific part should be replaced? Is it just the relay, or do I need to replace the solenoid or pump as well?

Anonymous 2014-04-07 13:32

Basic electrical troubleshooting steps: - Is the relay stuck in the 'on' position? (Yes/No) - Is the ground wire from the PCM properly grounded, or is the issue with the PCM itself? - If the relay is faulty, does that point to a failed solenoid or pump as the root cause? Use a digital multimeter (DVOM) or test light to probe the relay terminals. Start by testing at the relay — this will help isolate whether it's a component failure or wiring issue.

Anonymous 2014-04-09 15:21

Thank you all for your input. During my last service, the P2258 code was not present. A battery test on April 6 showed 12.96V, but two days later it dropped to 10.5V — indicating a blown cell. I replaced the battery and now the car starts reliably. The issue appears resolved. I'm grateful for the advice — this forum has been very helpful as a new user. I don't see a 'thank you' button, so I'm not sure if the platform supports it. Still, thanks to everyone!

Anonymous 2014-04-09 16:46

Always monitor for recurring issue codes — they rarely appear without a valid cause.

Anonymous 2014-04-11 13:25

I agree — I've been keeping an eye on the system. While it was odd that battery voltage dropped during normal operation, the replacement of the battery resolved both the starting issues and the check engine light. The car is now running fine and passed emissions testing. Thanks again for your help!