Toyota nadia shows trouble code 98 soon after car starts has got 1az engine.whats the faulf code meaning

Why would you change the fuel pump? Fuel Pumps work or they don't work at all. They have the correct pressure to make the vehicle run, or they don't. They don't make the vehicle run a bit slower when going up a hill or accelerating. Stop guessing what the fault is. You need to check the engine diagnostic code when the light comes on. The code tells you the fix. You need an auto electrician with a pro grade scan tool computer. It can record what happens on a drive. You can drive him and the computer to that hill and record it.

https://www.google.com/search?q=mobile+auto+electrician+near+me

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the NOT TOLD LIST.
1: NO VIN TOLD OR COUNTRY ! wow !
2: NOT TOLD DTC ERRORs CODES SEEN ON SCAN TOOl.?
3: NO TOLD IF HAVE ABS. brakes.
4: GOT AWD OR FWD, >? 2wd or 4wd?
5: AUToMATIC TRANSMISSION 4SPEED. or manual box.
GF-SXN10 (this box?)

ENGINE D4 MEANS DIRECT INJECTED, 3S-fe


"2.0 L I4 DOHC 3S-FE (YES)D4
2.0 L I4 DOHC 1AZ-FSE(no)
The D-4 engine car was equipped with a SuperECT with a flex lockup."<<, means early TCC lockup
open can wonder to do that the a/t box may have 2 or 3 sensors to do that smoothy but gee no such transmission here in USA.

a car this old can have 7 speed sensors.
4 abs
1 to 3 on A/T box or just 1 or just one for AWD VSS1.
or just 1 for manual transmission.

that is why we beg for VIN. so we know what is under the skins (body shell) of the car.
if you buy the service manual for this car
the answer is there !

As the engine starts and the engine light is on it means the engine management system has discovered a fault that will affect the exhaust emissions. The fault will be recorded in the system memory and that can be retrieved by plugging a JOBD2 compliant scanner or code reader into the OBD port.

I think you should try this website big-manuals . It helps you repair your vehicle easily without more help. Ask the girl in chat at the bottom of the page

what are your codes telling you code readers are very cheap 30 to 50 will get you started or auto stores will scan for free

Where is nin Sensor located in 1az engine sienta

Need more info......Need mileage..,when was it tuned up and or serviced last...Need all codes showing on scanner..Did a Common garage replace your parts or are you a do it yourselfer..?..How long has this been happening ..How far has it been drove when it started happening..?

Google it

That is how you find your OBD Codes

OBD & your code

OBD P1215

The automatic idle valve may need cleaning or the control module that operates it may be bad.

check engine light on means something wrong with engine,
you can use this tool check your toyota and clear the fault codes.