Honda Engine Error Code P1128: How to Fix It

Q: Can I drive with Honda error code P1128?

You can drive short distances, but the engine may run poorly with reduced fuel economy and power. Address the issue promptly to prevent potential engine damage.

Q: How much does it cost to fix Honda P1128?

Costs vary from $20-50 for vacuum hose replacement to $100-200 for a MAP sensor, or $300-600 for intake manifold gasket replacement at a shop.

Q: What causes Honda P1128 error code?

Common causes include vacuum leaks in hoses or intake manifold gaskets, faulty MAP sensor, damaged wiring, or clogged MAP sensor vacuum port.

Q: Will P1128 cause my Honda to fail emissions testing?

Yes, this error code will likely cause your vehicle to fail emissions testing. The issue must be resolved and codes cleared before testing.

Abstract

Honda error code P1128 indicates that the Manifold Absolute Pressure (MAP) sensor is reading lower than expected values. This typically means there's a vacuum leak, faulty MAP sensor, or wiring issue affecting engine performance and fuel economy.