1999 honda civic dx sohc. p1509

Question

I just finished a transmission replace from salvage yard. When I started engine now I have a high rpm condition with revs. Can a sensor on the trans mission cause this or is it just a coincidence?

Answer 1

Hi there,

The code P1509 indicates an issue with the idle air valve. Here is some info regarding this code.

P1509 HONDA - Idle Air Control Valve System High RPM

Read more: https://www.autocodes.com/p1509_honda.html

The code P1129 indicates an issue with the manifold absolute pressure sensor. Here is some info regarding this code.

P1129 HONDA - Manifold Absolute Pressure Sensor Circuit Higher Than Expected

Read more: https://www.autocodes.com/p1129_honda.html