Honda 21-01-p1253- -

A damaged wire between the VTEC pressure switch and the ECU can cause a high-voltage reading. Look for chafed wires near the engine harness, especially near the timing belt cover or exhaust manifold.

This is the #1 cause for VTEC failures. The system relies on precise oil pressure; if oil is low or degraded, it cannot mechanically move the VTEC pins. honda 21-01-p1253-

In advanced cases, the camshaft thrust plate wears down, or the rocker arm pin binds mechanically. If oil pressure is perfect and the solenoid clicks, but the code persists, you may have internal engine wear. A damaged wire between the VTEC pressure switch

The VTEC system uses oil pressure to switch between different camshaft profiles to optimize fuel efficiency at low RPMs and performance at high RPMs. When P1253 is stored: The system relies on precise oil pressure; if