How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask david Your Own Question
david, Heavy Duty Repair Mechanic
Category: Honda
Satisfied Customers: 1500
Experience:  Certified Master Technician,Certified in diesel & gasoline engines
Type Your Honda Question Here...
david is online now
A new question is answered every 9 seconds

Can not figure out trouble code p1399 (manufacturer contrl

This answer was rated:

Can not figure out trouble code p1399 (manufacturer contrl ignition system or misfire.

Hi thank you for your question hope this helps.


P0135 = O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)

P1399 = Random cylinder misfire.




This code refers to the front oxygen sensor on Bank 1. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0135.


A code P0135 may mean that one or more of the following has happened:

  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness


This is caused by a clogged EGR valve ports.


Hope this

Good luck

Customer: replied 7 years ago.
David, I don't think my 2000 honda cr-v is equiped with a EGR valve. According to the service manual only civics are equiped with the EGR system. If you think my CR-V isequiped with the valve, where is it located. Thanks, John.

Sorry you are right the CRV did not have an EGR system.




Customer: replied 7 years ago.
any thoughts on what the p1399 trouble code might be. The book only says manufacturer contrl ignition system or misfire. Thanks

P1399 = Random cylinder misfire


P01399 is a misfire code, you have replaced all the parts that are related to the spark plugs so we know that is not the problem.


Have you had a compression test if the cylinder compression is to low do to wear.


Next i would check and adjust the valves CR-V intake valve is 0.003-0.005 in. (0.08-0.12mm). CR-V exhaust valve is 0.006-0.008 in

david and other Honda Specialists are ready to help you