P0401, P1359, P0420 Fault Codes on 1997 Honda Prelude - How to Fix and Reset

A common cause of P0401 is clogged EGR ports in the intake manifold. Cleaning or replacing these components may resolve the issue.

How can I fix a clogged EGR system? What's the typical cost for professional cleaning or repair?

The best approach is often to remove the intake manifold and thoroughly clean it. Some users report that removing specific EGR components allows better airflow. Always check vacuum lines before disassembling. I haven't personally done this, so take precautions. Let me know how it goes!

I had an EGR flush performed at EZ Lube and both P0420 and P0401 codes disappeared. Now only P1359 remains. Any insights on this one? Thanks!

Still working on the P1359 code—could it be related to engine timing or a sensor issue? What exactly is an EGR flush? Is it cleaning intake ports while driving, or throttle body cleaning? Who performs this and how does it work? I'm curious if it's effective—I might try it!

I took it to EZ Lube—they performed a fuel system cleaning service. According to their description: Recommended every 15,000 miles, this service removes deposits from injectors, intake manifold, and emissions components. Benefits include improved acceleration, better fuel economy, and elimination of 'rotten egg' odor. The process involves cleaning while you wait.

P1359 is likely related to the crankshaft position sensor circuit. Is this code still active? Are there any other symptoms like long cranking times, stalling, or no-start issues? If so, that would point to a sensor or wiring fault. The service at EZ Lube sounds similar to a MotorVac fuel system cleaning—great option for maintenance! Good luck and let me know how it goes.

No other codes are present, but the car sometimes takes longer than usual to start. Does that mean the crankshaft timing is off?

Do I need a professional to adjust the crankshaft position? What are my options for clearing the check engine light once the issue is resolved?

The crankshaft position sensor itself isn't adjustable. The problem may be with the sensor or its wiring circuit. If it's faulty, you might need a replacement or electrical troubleshooting. Thanks for sharing—keep me posted on your progress!

The car starts fine now, but I'm hearing a strange noise when accelerating. It sounds like a tire flat from the engine side. When I accelerate out of gear, no noise occurs. Can anyone explain what this might be?

Is your vehicle a stick shift or automatic? Axle shafts are common failure points on Honda models. Also check the balancer—slipping could cause both engine noise and long cranking times. A cracked flywheel can also produce similar symptoms. Is the check engine light still active?

It's a stick shift, and yes—the check engine light is still on.

I can't diagnose the noise without hearing it, but inspecting the balancer or flywheel may help. If the noise only occurs when wheels are turning, consider wheel bearings or axle shafts. What happens if you hold the clutch in? That might isolate whether it's drivetrain-related.

It was an axle/CV joint issue—fully repaired. I haven't yet reset the check engine light to confirm if the codes have cleared. Thanks for all the help!