What Do Codes 25 And 26 Mean? And How To Fix It?

[tiggere77]

thank you guys for helpin me with my sc300 but now i took 2 codes for the car that said 25 and 26 something about air-fule running rich but does anyone know how to fix this? :cries: :cries:

[tHeWiFe]

thank you guys for helpin me with my sc300 but now i took 2 codes for the car that said 25 and 26 something about air-fule running rich but does anyone know how to fix this?:cries::cries:

First off try this:

Diagnostic Code Clearance

1. After completing repairs the diagnostic code retained in

memory can be cleared by removing the DOME fuse for 10

seconds or more, with the ignition switch off.

2. Check that the normal code is displayed after connecting the

fuse.

Some information taken from the Circuit Description

with suggested troubled areas for these two codes

Hope it helps.

25 Air Fuel Ratio Lean Malfunction

(1) Main oxygen sensor voltage is 0.45 V or

less (lean) for 90 sec. under conditions

(a) and ( B ).

(2 trip detection logic)*2

(a) Coolant temp.: 70°C (158°F)

or more.

( B ) Engine speed: 1,500 rpm or more

Troubled area for above referenced

Open or short in main oxygen sensor

circuit

Main oxygen sensor

Ignition system

ECU

(2)*1 Difference of air–fuel ratio feedback

compensation value between front (No.

1 3 cylinders) and rear (No. 4 6

cylinders) is more than 15 percentage

for 20 sec. or more under conditions (a)

and ( B ).

(2 trip detection logic)*2

(a) Engine speed: 2,000 rpm or more.

( B ) Coolant temp.: Between 60°C

(140°F) and 95°C (203°F).

Troubled are for above referenced

Open and short in injector circuit.

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction (skipping

teeth of timing belt)

Ignition system

Compression pressure (foreign object

caught in valve)

Air flow meter (air intake)

ECU

(3)*1 Engine speed varies by more than 15

rpm over the preceding crank angle period

during a period of 20 sec. or more under

conditions (a) and ( B ).

(2 trip detection logic)*2

(a) Engine speed: Idling

( B ) Coolant temp.: Between 60°C

(140°F) and 95°C (203°F).

Troubled area for above referenced

Open and short in injector circuit.

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction (skipping

teeth of timing belt)

Ignition system

Compression pressure (foreign object

caught in valve)

Air flow meter (air intake)

ECU

26 Air Fuel Ratio Rich Malfunction

1) Difference of air–fuel ratio feedback

compensation value between front (No. 1

3 cylinders) and rear (No.4 6 cylinders) is

more than 15 percentage for 20 sec. or

more under conditions (a) and ( B ).

(2 trip detection logic)*2

(a) Engine speed: 2,000 rpm or more.

( B ) Coolant temp.: Between 60°C

(140°F) and 95°C (203°F).

Troubled area for above referenced

Open and short in injector circuit.

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction (skipping

teeth of timing belt)

Ignition system

Compression pressure (foreign object

caught in valve)

Air flow meter (air intake)

ECU

(2) Engine speed varies by more than 15

rpm over the preceding crank angle period

during a period of 20 sec. or more under

conditions (a) and ( B ).

(2 trip detection logic)*2

(a) Engine speed: Idling

( B ) Coolant temp.: Between 60°C

(140°F) and 95°C (203°F).

Troubled area for above referenced

Open and short in injector circuit.

Fuel line pressure (injector leak, blockage)

Mechanical system malfunction (skipping

teeth of timing belt)

Ignition system

Compression pressure (foreign object

caught in valve

Air flow meter (air intake)

ECU