P1259 - VTEC system malfunction

P0135 - A/F sensor 1 heater system malfunction



Can anyone tell me what I can do to fix these codes?

 

Okay, after a little research it looks like the A/F sensor is the o2 sensor?

Still don't know where to start with Vtec system malfunction.......

 

Whenever you have more than one code, reset codes and drive until the CEL comes on again then see which code reoccurred first. One of the codes may be very old.

To check sensor: With the engine cold, unplug the first O2 sensor and measure resistance of the sensor between the two wires that are the same color (that is the heater). If it's open circuit, replace sensor.

 

Okay, I replaced the missing bulb for the CEL and I cleared the codes. Now I am only getting code 22 - Vtec pressure valve.

Also, the guy who had the car before me just left the jumper wire in the service connector. Is that okay, or should I remove it after I've fixed the problem?

 

Well, there was a slightly loose plug on the Vtec assembly(whatever you call it). I guess it was the pressure switch? Anyway, I cleared the codes and the CEL is off now. I also learned that leaving the jumper in makes the CEL stay on.

 

Always remove the jumper wire for normal driving. You won't get proper performance and gas mileage with it in.

 

CEL came back on a couple of days ago. Code 23 - knock sensor. I just put a new one in a few months ago. Could it actually be sensing a knock? I haven't heard anything, but I'm not sure if I'm supposed to.

 

Okay, I did a search on here for "knock sensor" and tons of stuff comes up, but nobody posted what worked for them. Is that because nobody really ever solves this issue? Is it acceptable to ground the wires and not worry about knocks???