CEL Code 128 ?

[hiss]

Have just read off the CEL code from the dash. I'm getting a 12 then 8 (that means 128??) I thought it could be 13-7 in the beginning though (so it might be that).

http://homepages.ihug.co.nz/~ccgrant/celcheck.htm

From this page the numbers only go up to 70 odd so I'm really unsure what to make of the code. It's a 2003 Forester XT (SG5) if that helps.

any idea what it could be, or how to determine?

[Guest boostin]

That doesn't sound right. The fault codes for that vehicle should be Pxxxx for powertrain (engine and transmission) or Cxxxx for chassis (airbag and ABS/VDC).

See a full list here - http://www.obd-codes.com/trouble_codes/

The list is a bit further down the page.

[subieboy]

 boostin said:

That doesn't sound right. The fault codes for that vehicle should be Pxxxx for powertrain (engine and transmission) or Cxxxx for chassis (airbag and ABS/VDC).

See a full list here - http://www.obd-codes.com/trouble_codes/

The list is a bit further down the page.

HUH???

Man I am suddenly lost here boostin, Isn't he talking about CEL codes? not chassis codes? ??? EDIT: Oh now I see Boostin, read the Ihug pages one hiss its the same stuff just minus the P/C bits

Hiss, are you able to redo the CEL check and post again please?

[Guest boostin]

No the ihug page relates to early codes only. From 2000ish they went to the OBD2 codes, which are completely different.

Check that link I posted. Thats whats in use currently.

[log1call]

I think that code is for a stuck open thermostat.

[Guest boostin]

 log1call said:

I think that code is for a stuck open thermostat.

I've never heard of that one!!

[Guest]

hiss off ;D

[subieboy]

 boostin said:

No the ihug page relates to early codes only. From 2000ish they went to the OBD2 codes, which are completely different.

Check that link I posted. Thats whats in use currently.

Meh, My GTB has OBD2, it also still displays CEL codes (well it did for the stupid AFM)

[log1call]

V: DTC P0128 — COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW

THERMOSTAT REGULATING TEMPERATURE) —

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of thermostat function.

Judge NG when the engine coolant temperature is lower than the estimated engine coolant temperature and

the difference between them is large. Judge OK when the engine coolant temperature becomes 75°C

(167°F) and the difference is small before judging NG.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

(1) Valve (6) Rubber packing

(2) Spring (7) Stop ring

(3) Stopper (8) Wax element

(4) Piston (9) Jiggle valve

(5) Guide

Secondary Parameters Enable Conditions

None

EN-01692

(9)

(2)

(6)

(8)

(7)

(5)

(4)

(3)

(1)

(2)

GD(STi)-52

GENERAL DESCRIPTION

DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA

5. DIAGNOSTIC METHOD

• Abnormality Judgment

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 30 seconds.

Judgment Value

Time Needed for Diagnosis: 30 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

• Normality Judgment

Judge OK and clear the NG when the malfunction criteria below are completed.

Judgment Value

6. DTC CLEAR CONDITION

• When the OK idling cycle was completed 40 times in a row

• When “Clear Memory” was performed

7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION

• When the OK driving cycle was completed 3 times in a row

• When “Clear Memory” was performed

8. FAIL SAFE

None

9. ECM OPERATING AT DTC SETTING

• Memorize the freeze frame data. (For test mode $02)

• Memorize the diagnostic value and trouble standard value. (For test mode $06)