Hi guys im new on the forum i need a little help here.

i hav a Civic 95 USDM swapped to d15b vtec with a p28-A52 ECU.
My car is trowing a code 41 primary oxygen sensor heater circuit malfunction
i hav a bad sensor and i replace the oxygen sensor by a brand new Denso OEM and i still hav the cel, i check the harmnes for shorts and no shorts on the wires i also check the ecu wires connection and test with a multimeter and i hav voltage on the ecu heater wires(black/yellow wire and black/orange wire)
and the problem still, even after sensor replace i hav a poor milliage like 17mpg

did u guys got an idea of what could be my problem :s help pls !!! Thx

 

Do you have a code 4 as well or was that a typo?

Edit, title fixed

 

Your ECU may be bad.

 

sorry was a type error it is a code 41 primary oxygen sensor heater circuit malfunction.. u said my ecu is bad but everything is running good at the car except the problem with the low millage and the cel that do not turn off :s.

can u tell me how i can test my ecu for problems??

 

I can't say whether or not your ECU is bad. But it sounds like you have done a good job so far ruling out the O2 sensor and its wires. The next logical step is to swap in a known good ECU to see whether the problem goes away. Unfortunately, in this case, there is no straightforward way to test the ECU itself.

 

ok, i have see on the internet that some people say something about a fuse #15 under the dash related to the O2 sensor.. did u hav ever hear about that cuz that fuse is in good state but i hav a bouncing speed gauge this problem could be related to that fuse or not?

thx again

 

The fuse 15 TSB only pertains to 96-00 Civics not to your 95 Civic. (Click the Fuse 15 TSB in my signature.)

 

ok, thx .. i will do the test with other ECU :S, i'll check and let you know

 

i ha that same problem i was getting that code and code 43 and my mpg where 13-16 and my timing belt was of by a couple of teeth

 

how do u solved the problem?? did u said that the timing belt was your problem?

 

the only problem that concerns me is the low millage, can u guys have any idea that what cold be that problem.. cuz my question is, even if i have a good sensor that is sending he values to the ecu the cel could affect my millage?

i change air filter, spark plugs, other suggestion?

 

hi guys.. me again..

i have test my car with another ECU P06 (no vtec but work for the propouse) and the light is gone. no more code 41 on my car.. and when i put my p28 the light comes again so my ECU is bad!

 

At least you now know what the problem is.

 

probably your ecu

 

^That's pretty funny.

 

You're brilliant. He already said it was the ECU.

 

why cant people be polite i know he said it i just wanted to give the same opinion like eveybody else does in diffrent threads bu o well you wont understand lates

 

Jejejejejejej i will buy another ecu im planning yo buy a P08 that is the correct ecu for my d15b Vtec now the cuestion is will my 4 wires new denso oxygensensor work with the P08 without any modifications i heard that the ecu will only use the sensor data pin (D14 on ECU) to work and the ground is on the manifold, is that info correct? Can i buy a P08 with no problem?

 

You can use a P08 fine with the engine and the O2 sensor, be aware the sometimes JDM and USDM automatic transmissions are somewhat different and require that the right type of ECU be used. That P28 may be repairable btw depending on just what happened to it.

 

I dont know exactly what happen to my p28 maybe the "universal" o2 sensor that it hav when i buy it cause the error there was a poor conection and wire splited maybe a short on the old sensor cause the error to the ecu, the guy who give m the p06 for the test told me that my p28 can be repaired but the price for the repair is almost te same that buy a ecu, he wants my p28 and money feed back and he will give a p08 ( maybe another repaired p08)

i will check the transmission number and post and see if it will run fine on the p08