Not starting,we diagones fault code p1604 - 2010 Toyota Fortuner 3.0D-4D

Personally I would have changed with correct oil, and start there. You may have a bad oil level sensor,or connector or wiring. Good Luck

P1604 https://www.engine-codes.com/p1604_toyota.html

C1241 https://www.engine-codes.com/c1241_toyota.html

P1604 TOYOTA - Startability Malfunction
Repair Importance Level: 3/3
Repair Difficulty Level: 3/3

Possible causes
Low Battery charge
Starting system
Low quality fuel
Clogged Fuel filter
Faulty Engine Control Module (ECM)

These codes are indicating a starting problem and rough idling. Code p1604 is a very vague code and diagnosing it without having a symptom is very complicated. And code p1605 is rough idling which means that the computer have noticed a rough idle situation usually this code is accompanied by other codes or if it's alone then I would suspect a fuel pressure issue. These two codes involve diagnosis and we'll need to dig into this problem deeper to find out what's causing them, Unless you are an experienced technician who need assistance then I will suggest that you take your vehicle to your local toyota dealership and they should be able to find the problem.

p1603 should help by reading this below
http://corolla-club.ru/doc1/c61151d7ba7b9bee3c247e42b685b253.html

P1604 TOYOTA - Startability Malfunction https://www.autocodes.com/p1604_toyota.html

For a Toyota, it indicates a startability problem, it is a very vague diagnostic troubleshoot code and therefore not component specific.

Components to check, Crank Shaft Position sensor, Spark Plugs, MAF sensor, fuel pump... etc.

For a Toyota, it indicates a startability problem, it is a very vague diagnostic troubleshoot code and therefore not component specific.

Components to check, Crank Shaft Position sensor, Spark Plugs, MAF sensor, fuel pump... etc.

code p1604 refers to starting system --malfunction===causes--wiring---connections--vacuum leaks--MAF sensor--ignition system--engine coolant temperature sensor--fuel supply system--throttle body--variable valve timing system---A/C system--- power steering control control--- ECM
Try to think back to the symptoms before the engine failed to start
were you in snow, did it get hot, was it lagging in high rpms,
did it just stop or was it misfiring
each symptom will point to an item in the list of causes.

Reviewing the tech info that comes up on a google search, this code is just about worthless for diagnostic purposes. Go back to basics. Does fuel pressure drop just before car dies? Once dead, if you crank it do you still have spark at the plugs? Most likely causes if electrical are coil/ignition module, cam/crank sensor, coolant temp sensor, bad converter or muffler.

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if you look that up on a normal OBD code its listed as P1604 Code Word Unregestered However for a volvo thats a code for Control Module Self Test, Speed Monitoring which would indicate the ECM or a wiring problem ( usually just a loose connection,, so check the connections on the ECM, which you can have scanned by the dealer, Volvo codes vary from the normal coding on most cars, so be careful when getting codes and their meanings