Hi All, I recently changed spark plugs and adjusted valves on my 07 RDX turbo 180K. I had a challenge removing the valve cover so ended up putting a fair amount of pressure on the ignition wiring harness that normally passes above the valve cover running to the ignition coils. After everything was reassembled, I ended up with a P0238 code that I can't seem to get rid of. I have researched forums and the web for tips, but everything I have done doesn't seem to find the fault causing the error code. I have checked the wiring harness for cracks, rips tears etc..., nothing appears shorted out, and checked voltage to the boost sensor. I am at a loss at the moment, unless it is actually the sensor itself, but why would that sensor go from good to bad simply because I removed the intercooler to change spark plugs? Voltage checks seems to indicate the sensor is still good, (5V incoming, .03 V outgoing), and there are areas of the wiring harness I cannot access to check for shorts. I may end up replacing the sensor, but they aren't cheap to start throwing money at it without exploring other options first. Anyone have any suggestions? Thanks.

 

***Update***
For some unknown reason, this condition has corrected itself. After sitting overnight, and upon starting in the morning, for some reason, the light is no longer on. I have no explanation, but I'll take it. Who know s for how long....of course!

 

Just changed my plugs and same thing...car drives fine, no lack of boost or surging. We'll see what a night of rest does. I have a feeling it's the plug that connects from the bypass valve to the sensor on the intercooler. Perhaps that connection doesn't hold up as well as we'd like it to over time.

 

I guess I got lucky, I changed my spark plugs on my 07 RDX this past weekend & no codes...
this is probably an obvious question, but did you guys try disconnecting the battery for a few minutes.
Mine threw up a Check Engine just from changing transmission fluid ( 2x3 qts). Disconnected the battery for a few minutes & it was gone.

 

I just cleared it via a code reader and so far so good. I do know that the gasket between the bpv and the intercooler was bad, and until I could get a formal replacement I put some high-temp gasket goop in there and bolted it down...again, so far so good.

 

I've been getting this code intermittent for probably 2 years. It comes and goes.

aside from pulling apart, cleaning and carefully putting everything back together I've done little to solve problem.

Recently replaced 2 of the solenoid valves and it hasn't happened in a while.

would love to know the answer.

 

I just changed my spark plugs last night and I am having this code… I let it sit overnight and checked this morning before I had to leave for church and the code is still there… I ordered a new boost pressure sensor to replace it, but I haven’t driven it around or anything to see if it behaves different… Do any of you guys have a fix?

 

The boost sensor is the thing that clips onto the front right of the intercooler (looking at the front of the car with the engine bay open).

Is it possible you didn't plug it in all the way or possibly damaged it? Replacing the sensor will provide some insight.

The boost sensor has nothing to do with the ignition system, other than the fact that you have to remove it to remove the intercooler to get to the plugs & coils.

 

Did the code occur just after you changed the spark plugs?
Check to see if wire harness connector it's plugged in correctly and if there may have been any damage to the wiring. The OEM sensor is now $485 and to be certain if the sensor is actually bad you can swap the one installed in the intercooler with the one installed in the intake manifold and see if the code changes or stays the same, if sensor is bad the problem will follow the bad sensor to the new location and produce a different code. These two MAP sensors are identical part numbers, 37830-RWC-A01.