Question 1

Does this replace the rz-0158?

Accepted Answer

Part I received looked exactly like pics, and identical to the part I replaced.Second pic in listing shows "RZ-159" ... which I do not think is exactly the same as an RZ-158 ... may or may not work?I would feel confident ordering this part if you have one of these:Fits 1998 to 2001 Prelude, 1998 to 2002 Accord, 1998 to 2004 Odyssey, and 2003 to 2004 Pilot, otherwise, not sure.The "Wells" version of this part had no writing on the outside, so I returned it and got this one instead.Parts store should have online vehicle compatibility check also to double check.  I found Amazon had best price on Wells part and this (OEM) part.Sorry not more helpful.

Question 2

i have a 2004 honda civic and it wont start some one tol me it was the main relay is this the part i need?

Accepted Answer

The Fuel Pump Main Relay was my problem, here is/was the symptoms. In hot summer weather when the window are up the cracks in the solder of the FPMR would separate and cause an open circuit and not allow the car to fire, engine would turn over til the battery went dead, would not fire though. Now all I had to do is open the windows and doors and allow the car to cool down enough for the solder weld in the FPMR to cool down and close up and touch and the circuit would be complete and the car would start. Replacing the Fuel Pump Main Relay fixed my problem. Please go to YouTube and type in 2004 Honda Civic won't start in hot weather and if this is your problem you will find there were/are millions just like you. Mine is a 2001 Honda Accord and there millions with my problem.   I found untold thousands of people with Honda's from the mid/late 1990's to mid 2000's with the same problem. Do a Google search and YouTube search of your problem and you may very will find this is your problem. I hope this helped in any way, this part I purchased was from Amazon was the answer to my problem and at a very reasonable price. Good luck.

Question 3

I have a 1999 honda accord, the car cranks but wont stay on. Could this be my solution? If not what could it be?

Accepted Answer

my mechanic (whom happens to work for a honda dealership) told me the relay will start to "stick" especially in warmer weather because i was having the same problem.  my 02 honda coupe V6 would occasionally shut off on me while driving and or wouldn't crank over to start.  i recently purchased the part on amazon and installed it myself on 5/5/17 after a few instructions and youtube videos recommended by my mechanic.  ever since i replaced it with this genuine honda part (which i recommend) it hasn't shut off on me and has started every time.  if you are interested in the youtube video i watched which was very helpful, go to youtube.com and search " '91 honda accord main relay replacement "  postet by amber waite.

Question 4

when installing new relay do you have to disconecct battery?

Accepted Answer

No, no current to relay if key is in off position

Connector Type	Screw
Contact Type	Normally Open
Brand	Honda
Operation Mode	Automatic
Coil Voltage	12 Volts (DC)
Minimum Switching Voltage	12 Volts (DC)
Specification Met	OEM
Manufacturer	Honda
Model	Genuine Honda RELAY ASSY-, MAIN
Item Weight	2 pounds
Product Dimensions	4.5 x 2.6 x 2 inches
Item model number	39400-S84-003
Is Discontinued By Manufacturer	No
Manufacturer Part Number	39400-S84-003
OEM Part Number	39400-S84-003

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Honda Genuine 39400-S84-003 Main Relay Assembly

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