Where do you go to check engine cod es, and which

Question edited for clarity.
Question moved from Spanish car company Seat, (pronounced See-At).

Check out the link

https://www.google.com/search?q=2006+HOLDEN+RODEO+RA.+LOCATION+of+TCCM

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1 check brake fluid and pads front brakes.when they are worn out,
the oil drops and contact will go on.

the check4WD light stays on, what is the problem on a Rodeo 2004 Isuzu?

The way to stop the check engine light is to pull the error code(s) from the computer and resolve what is indicated. REMEMBER the code is a CLUE and not necessarily the issue, for example, an intake leak can cause a oxygen sensor to register out of range....
The light would reset automatically, in absence of errors.

1
Locate the 16-pin data link connector. Connect the jump wire to terminals 4 and 9 of the connector. Turn the key to the "On" position without starting the engine.
2
Watch the "Check Engine" light. This light will begin to flash in specific patterns to indicate a 1- or 2-digit Diagnostic Trouble Code. The flashes will be long for the first digit, short for the second digit and blank if the digit is 0.
3
Record all the codes given. The "Check Engine" light will display the codes in sequence and then keep repeating them in order. Refer to your repair manual to check for the meaning of the codes.

Check for leaking intake gasket.

Check your engine *******

This is straight from Haynes Repair Manual for 1989-1997 Isuzu Amigo/Rodeo/Honda Passport (book # 47017:
The 12 pin Assembly Line Data Link (ALDAL) terminal is located under the dash on the driver's side on 3.1L engines. To retrieve the trouble codes, connect a jumper wire to terminals A and B. It may be covered with a plastic cover. They suggest using a paper clip to jumper the two terminals-then turn ignition switch to ON position (NOT ENGINE START). Check engine light on dash will flash-one flash-a pause-then two short flashes-indicating code 12-diagnostic mode. After self checking-if there are any trouble codes-the light will flash proper codes using mentioned method.Note the flash code then call a shop with your info for what ails your Rodeo.

A mere 2,400km into the life of my 07 Rodeo TD 4WD, I used 4L for about 2km of medium-steep/slippery track. After stopping and selecting 2WD the 'Check 4WD' light appeared, meaning I was stuck in 2WD for the rest of that trip. Luckily I was able to complete the trip in 2WD without incident.

The dealer blamed me for 'not following the instructions in the manual' (utter codswallop), 'fixed' it, and very reluctantly gave me a scribbled set of instructions on resetting the system, which I've included below.

When I suggested that these instructions should be included in the manual, the response was 'not necessary if owners use the system correctly'. More cods.

Here's how to reset it:

1. Ignition off, hold all 3 buttons (2H, 4H & 4L) in together

2. Switch ignition on to 'reds' position (last position before start)

3. Hold in this state for 30 seconds

Hope this may be of use !!

your owners manual usually tells you which pins to jump to get the code. you could also just take your car to checker or auto zone (or any of those places for that matter.) they usually offer free engine scans.and some even tell you what the possible problem is.