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P1388 JEEP - ASD or CNG (compressed Gas) Relay Control Circuit
Possible causes
- Faulty ASD Relay (most common cause)
- Faulty CNG Relay
- ASD or CNG Relay harness is open or shorted
- ASD or CNG Relay circuit poor electrical connection
- ASD or CNG Relay poor ground or supply voltage condition
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The OBD-II error code P1399 and P0141 for a Honda CRV 1999 are as follows:
P1399 - This code indicates that there is a problem with the misfire detection system in the vehicle. This code is often accompanied by other codes that indicate which specific cylinder is misfiring. Causes of this code could include a faulty ignition system, a clogged fuel injector, or a problem with the engine control module (ECM).
P0141 - This code indicates a malfunction in the oxygen sensor located on Bank 1, Sensor 2. This sensor measures the oxygen content in the exhaust gas after it has passed through the catalytic converter. Causes of this code could include a faulty sensor, a damaged sensor wiring harness, or a problem with the vehicle's computer.
It is recommended that you have a certified mechanic diagnose and repair these issues to ensure proper operation of your vehicle.
Code 505 is a problem with the idle air control valve. Code 309 is noting a cylinder 9 missfire on engines with 10 cylinders which would not include yours. That may be a fluke or not the right number. Code p1399 is brand specific and for Honda it usually means random miss. The code 505 could be the idle control valve or a vac leak. The computer can not control idle speed by using the valve. The miss codes mean the cylinders are not producing power when they should be. Which may or may not be ignition. It could also be fuel or mechanical problems. If you have not replaced the plugs and done the usual maintenance stuff in the past year or two, I would start with the basics. Be sure and look at the inside of the dist cap and rotor.
P1399- Manufactures control Ignition system OR Misfire
If only one of your cylinders was misfiring, you probably would be getting a more specific code than P1399.
Also check the distributor rotor along with the cap and coils and wires; the EGR valve to make sure it doesn't leak; your
fuel pressure which can cause random misfires if the pressure is too
low; and injectors if they are really dirty. If you have really high
mileage, I probably would first just change out the plug wires with a
new set, then reset the DTC and see if the code comes back.
have your codes cleared and as soon as your light comes back on get it checked right then. usually the first code that pops up is your problem,. and can cause faulse codes to follow. check your mass air flow sensor,. make sure the breather tube is on good and no cracks or tears in it. check fuel filter also hope this helps you in the right direction
Code P1399 is specific to Honda - it is an error code for "multiple variable misfires detected". P0301-P0304 are common OBDC codes for all cars, specifically "misfire in cylinder X".
You will get the P0301-P0304 codes on your OBDC reader when you plug it in (if actually errors), but will only find the P1399 if you select Honda as the manufacturer.
Just got these errors today on my CRV 2000. Now I have to figure out what is causing two of the cylinders to misfire.
Get your self a EGR valve it is sticking or the EGR port is blocked i
can tell you how to test it you have a volt meter but i am 100% THAT
WHAT IT IS
Code P1399 is a pending misfire code.
HOW TO TEST
1. Check EGR position sensor voltage on the White/Black wire at
idle - look for 1.1 - 1.2 volts with the EGR valve closed. If the EGR
position sensor voltage is higher than 1.2 volts, the EGR valve is
stuck open.
2. Can unplug the EGR valve and apply power to the terminal on the EGR
valve that the Pink wire would normally go to and ground the terminal
on the EGR valve that the Black wire would normally go to and see if
the engine stalls at warm idle.
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