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2002 Honda Accord P1491 Fault Code: EGR Valve Issue or Plugged Ports?

Model: 2002 Honda Accord Fault Code: P1491 Posted: 2009-07-05 09:29

Hi everyone, Thanks for your previous help. I'm now dealing with a 2002 Honda Accord (4-cylinder, over 100,000 miles) that has triggered the P1491 diagnostic trouble code. After reviewing forum discussions, it appears the issue might be related to the EGR valve — but I’m unsure whether replacement or cleaning is needed, and if a DIY repair is feasible or if professional intervention is required. Could someone please confirm my understanding of the P1491 code? Specifically: - What does P1491 actually indicate? - Is it typically caused by a faulty EGR valve or blocked ports? - Should I attempt cleaning first, or is replacement necessary? - Can this be safely handled at home, or should I consult a mechanic with experience in Honda diagnostics and emissions systems? Any insights would be greatly appreciated. Thanks again for the community support — it makes troubleshooting much easier! P.S. This vehicle has been driven extensively and shows no immediate performance issues beyond the check engine light.

Related fault codes
P1491
Comments (3)
Anonymous 2009-07-05 11:30

The P149

Anonymous 2013-11-26 13:02

I need urgent help — I recently removed the engine from my Honda Accord and now the vehicle shows P1491. How can I reset the check engine light and fix this issue as quickly as possible?

Anonymous 2013-11-26 14:20

Edward, you just removed the engine from your Honda Accord? That seems highly unusual — could you clarify what you're referring to? Engine removal typically doesn't trigger P1491 unless there's a wiring or sensor issue post-removal.