Fault code 4 wat does it mean - Cars & Trucks

the fault code will be specific to hino so take it to a service dealer for a code cause

The first fault code do you mean p1296 if so that is a cooling system malfunction you will need to check the temperature sensor.

The fault code p0411 is a Secondary Air Injection System Incorrect Flow Detected

And the p0304 fault code is a misfire detected on cylinder 4 possibly a coil pack maybe a plug

get it serviced?

Find a good electrician. It may be an electrical fault.

The 300 codes are for engine miss, 300 is random, 302 is cylinder number 2, and 304 is cylinder number 4.
Code 134 is for a dead O2 sensor and code 1124 is brand specific, for your car it means the fuel system is too lean.
Code 134 could be a faulty sensor or a wiring problem, and it could cause the other codes. Or the code 1124 could be a fuel pressure problem and that could also cause the other codes.
I would probably start with checking the fuel pressure and for vac leaks, then check the sensor to see if it is working.
The cylinder miss codes could be fuel problems or ignition related.

There are currently over 600 possible "generic" OBD Diagostic Test Codes (DTCs - also known as "fault codes") and several hundred "manufacturer-specific" DTCs that are possible causes of the malfunction indicator light to come on.
Some of the possible causes are not very serious. Others can cause severe damage to your car if you continue to operate it without correcting the cause of the DTC.

In short, you must scan your onboard computer network to retrieve the DTCs that have caused the light to come on. Until this is done and you have the DYC numbers available, NOBODY can tell you if this particular problem is serious or not.

Please also review the following article:
Why Is My Engine Light On?

Hi, the engine light is indicating that the computer has detected a fault. You will have to extract the trouble code to determine the fault. Go here for instructions on diagnostics: http://www.clublexus.com/forums/es300-and-es330/324049-obd1-check-engine-light-codes.html
Please get back to me with the results/trouble code for assistance in resolving the fault.

The battery light may be indicating a weak alternator. Check the voltage at the battery with the engine idling. If the voltage is less than 14 volts, replace the alternator.

Egr valve code

first code means random/multiple misfire cylinder (s) detected
second code means misfire detected number 1 cylinder, third code, miss=fire number 3 cylinder fourth code misfire number 4 cylinder
causes can be spark plugs, HT leads, ignition coils, injector, wiring fault, low compression/ engine mechanical fault

find the trouble code find out wat code mean,s wat an replace wat is not working the code will tell u wat,s not working hope this help u