1992 Toyota Paseo DTC 25

TRASHDUDE

MEMBER
1992 TOYOTA PASEO
4 CYL
FWD
MANUAL
23,200 MILES

I have a 92 Paseo that I picked up a few weeks ago and when I bought it I noticed the CEL was on. The DTC was # 25, I replaced the air intake because the stock on was cracked and unrapairable I had assumed causing the DTC 25 code. All was good for about 3 weeks then the DTC 25 code came back I am not getting any other codes so my question is. Where do I go from here? Is there something I should have adjusted when replacing the air intake? Thank you.
MW

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

DTC 25 Air/Fuel ratio lean.

Check the oxygen sensor/s switching activity

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)