Honda / Acura K20a K24a Engine Forum banner

P1259 code and cannot figure out why!

2173 Views 7 Replies 4 Participants Last post by  TedR
I have a 2002 RSX type s (k20a2). I recently bent a valve so I replaced the valves and everything else that got damaged. After getting the motor put back together the shop I brought it to said everything checked out and I could come get it.. I pick it up and drive it about an hour or so back to my house.. I had not engaged vtec the entire time.. I get about 3 miles from my house and the CEL comes on and my car goes into limp mode.. I get it scanned and get a P1259.. I unplug my ecu to reset it take it down the street and crack vtec.. I left the next day to go back to the shop and again CEL comes on.. I plug in my kpro and cel comes on for P1259 so I clear it and then hit vtec and I noticed it feels like it cuts out almost during the engagement.. every time engaging vtec I eased into it I NEVER mashed the pedal.. Ive since then put my stock ecu in and switched out the entire solenoid, went and took it for a drive and had no vtec at all.. I drove it around to give it a chance to pick up a code and no CEL comes on just no vtec engages... I noticed before switching the solenoid vtec would only engage like 1-3 times before throwing the CEL and going into limp mode.. I’m super stuck on what it could be so ANY and ALL possible leads/advice is much appreciated
See less See more
1 - 2 of 8 Posts
VTP sensor plugged in?
Run a data log in the KPro. You should see when MIL is activated and when the VPT sensor is triggered. You could also disable VTP to engage VTEC for a check.
I talk about the VTP sensor, not the switch for the oil lamp. Some looms don’t have the cable and plug for it, e.g. K20a from the DC5
1 - 2 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.