How is ABS trouble code 84-33 {VSA neutral sensor position not writing}

try resetting using a scan tool
get a good used one from the wreckers
as they all work of the wheel sensors for the ABS , check for wire or sensor failure
have the fault codes read to determine what sensor is failed

try this-- sit in the car put your foot on the footbrake then insert key & try to start ---if it starts and no warning lights come on --its your brake light switch

Vsa,abs,and brake all work off of the same sensor. You have a problem with one of the following system. Vsa vehicle stability assist, abs anti lock brakes, or the brakes themselves. My guess is either the abs or vsa

hello
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You need to have the vehicle scanned for fault codes and then the causes of those codes diagnosed.

You will need to have this car checked out by a professional with the right diagnostic equipment for Hondas. The Vehicle Stability Assist (VSA)***, brake and ABS warnings may just be due to a failed sensor or sensors but you need to have a proper diagnosis carried out so the causes can be identified and any failed parts replaced.

The flashing D light relates to the auto transmission and may well be a caused by a faulty sensor on the transmission or something else. The correct scanner should throw up any fault codes being generated. In the meantime if your Accord model has the engine bay filler tube and diptstick for the auto transmission , check your fluid level in the auto transmission.

***VSA..................
http://techinfo.honda.com/rjanisis/pubs/OM/RL0000/RL0000O00189A.pdf

Toyota Highlander C1233 OBD-II Diagnostic Chassis (C) Trouble Code Description Toyota Highlander car C1233 OBD-II Trouble Code The ABS module receives wheel speed readings from each wheel speed sensor and processes this information to determine if an ABS event is necessary. The wheel speed sensor detects the magnetic field of Reason For Toyota Highlander C1233 Code The reason of Toyota Highlander C1233 OBD-II Engine Trouble Code is C1233 Left Front Wheel Speed Sensor Input Signal Missing.

VSA and ABS use anti-lock brake sensors to complete the calculation.

The first thing to check is to make sure all 4 of the ABS sensors are clean.

Go to your local car wash and clean the wheels first.
KEY OFF / then reconnect the VSA sensor.

Pull the OBDII and email it to me.

The O/D light's flashing means there is some kind of transmission trouble.

The codes are..

Trouble Code (1) Probable Cause
12 ............................... System Operation Normal
21 ..................... No. 1 Shift Solenoid Open Circuit
22 .................... No. 1 Shift Solenoid Short Circuit
23 ..................... No. 2 Shift Solenoid Open Circuit
24 .................... No. 2 Shift Solenoid Short Circuit
25 ............................. TCC Solenoid Open Circuit
26 ............................ TCC Solenoid Short Circuit
31 ............ Vehicle Speed Sensor Open Or Short Circuit
32 ................ Throttle Position Sensor Short Circuit
33 ................. Throttle Position Sensor Open Circuit
34 ................ Defective Park/Neutral Position Switch
36 .............. (2) No Signal-Both Vehicle Speed Sensors
(1) - Check listed component for probable cause. Also check wiring and connections of specified component.
(2) - No signal from both transmission and speedometer mounted vehicle speed sensors.

If a trouble code is present, OD OFF light will flash a trouble code. The number of flashes will equal first digit of trouble code. After a one second pause, second digit will be displayed. If more than one trouble code is present, next trouble code will be displayed after a 3 second pause. Smallest number trouble code will be displayed first. Trouble codes will be repeated.
Hope this gave you some insight on the issue.

You are talking about the VSA activation indicator (triangle with exclamation point in the middle):
This indicator has three functions:

It comes on as a reminder that you have turned off the vehicle stability assist (VSA) system.

It flashes when VSA is active.

It comes on along with the VSA system indicator (the rectangle with VSA in it) if there is a problem with the VSA system.

This indicator normally comes on for a few seconds when you turn the ignition switch to the ON (II) position, and when the ignition switch is turned to the START (III) position.

Hope this helps you understand the problem.