On most cars the security system can be disabled by locking and unlocking the driver's door with the key.
SOURCE: 2003 Nisson Altima code P1610
P1610=Lock Mode--1 turn ignition switch OFF 2 turn ignition switch ON with registered key. (Do not start engine.) Wait 5 seconds. 3 Return the key to off position. 4 Repeat steps 2 and 3 twice ( total of tree cycles). 5 Start the engine. Does engine start ?? Yes...System is OK. Now system is escaped from LOCK MODE...if no start...Go to 3
P1612 is a lot of testing.......get back to me....
SOURCE: Crank position sensor for 2003 Nissan Altima
a crank position sensor , sends a signal to pcm about crankshaft position signal, the sensor controls spark timing and firing order. the signal is also used for pcm to detect a missfire!! it also sends this info to ignition module, any mechanic can replace a crankshaft sensor!! call a auto parts store and see if you can get one, the cost should be a lot less.
SOURCE: CRANK SHAFT POSITION SENSOR 20002 NISSAN ALTIMA
1st, Nissan had a recall on Crank position sensors for 2002-2006 Altima's. Check with you dealer before you go doing any repairs. You may discover you can get your car repaired at no charge.
NHTSA Campaign ID number :O7V527000
Symptom: Erratic behavior. Stalling and no starts and very difficult to diagnose due to the time frame in which the component actually malfunctions. The warranty should not be limited to the original owner.
I would also need more specifics as to which engine you have so I might assist you in where the location of the sensor is. The Altima had a 4 and a 6 cyl engine offered that year.
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