Hi! I've got a 2004 honda civic and multiple codes have s...

Hello, my name is \*\*\*\*\* \*\*\*\*\* to just answer! I will be assisting you with all of your vehicle questions today. Give me one moment while I review your question and I will be right back with your answer, or I may need some additional information from you about your vehicle. The site will ask for a phone call not me so please disregard thanks. Was there any work done prior to this issue? Also please post the codes that are stored?

There was no work done to it recently. I'll get those codes right away

Ok thanks.

P0339, P0122, P0134, P0171, P1456

OK bare with me . Have to look up a few things.

Ok this is caused usually from the harness for the crank sensor got damaged . Also was the timing belt ever changed ?

Okay. For the 3 years I've owned the car it has not been changed . When I bought the car the mechanic had swapped the engine with a used one that only had 75k kilometers on it

Ok you need to check the crank sensor harness as well as the sensor and fuses them selves. The timing belt regardless needs to be done along with the [water pump](/topics-water-pump-honda/) as well. Once I read the engine was replaced that also brought up a red flag. A lot of times they install these engines they forget to tighten grounds as well as leaving plugs loose. So unfortunately you need to take your times check the entire engine harness make sure nothing is loose or damaged . Then check the crank sensor and harness as well as the battery grounds and fuses. I have seen these engine swaps done wrong and damage the ECMS lets hope not. Last this is a bulletin for the ELD which throws a P1298 code but not always and can cause all sorts of electrical issues. These would be the next steps. Here's the bulletin. If you need more help please use the reply tab to continue our conversation. If no further assistance is needed, please consider rating me as 5 STAR!! It is much appreciated. You can rate at any time and we can continue to work on your question as this will not close out your question. Stay Safe !!! Bonuses greatly appreciated.

Awesome thankyou for the information! Also, I removed the ground from the battery and my radio now requires a code. If I get you the info needes are you able to get me that code? Or will I have to go through a honda dealer

That's a dealer only issue unfortunately sorry. Sometimes the sticker with the code on it is on the inside of the glove box wall or owners manual.

All good. I will take a look, thanks!

My Pleasure!! Stay Safe! Bonuses greatly appreciated.