Intermittent P0107 MAP circuit low EJ207

StimpyV2 · 01-25-2025, 11:54 AM

I’m currently having an issue with my V8 207 swap. It has operated fine for years, but now I have an issue. I get a P0107 code that actively disappears on acceleration, when I’m off the gas or idling the code comes back. During the times when the CEL is on the AFRs are very lean (from my AEM wideband) and runs very bad.

I’ve replaced the front o2 sensor with a new denso, cleaned the MAF, and inspected for vacuum leaks. Should I be looking at the MAP sensor? TPS?

I’m at a loss at the moment, I’m 500 miles my house so I don’t have access to my garage, but I do have logging abilities with romraider.

If someone could help out I’d appreciate it.

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StimpyV2 · 01-25-2025, 03:57 PM

*** small update, I unplugged the MAP sensor and it idles very lean but becomes drivable at 1/3 the normal boost level and runs smoothly other than idle.

If it is in fact the MAP sensor what my options as currently mine has the JDM one (PN: 22627aa260 denso) and these seem to be unavailable.

D-Rodman · 02-03-2025, 07:03 AM

I probably have one or two spares of those map sensors. Let me know if you can’t find one but you can probably source one on eBay.

Sent from my iPhone using NASIOC

StimpyV2 · 02-26-2025, 03:12 PM

It was in fact the MAP. Replaced it with a one from eBay and it fixed my issues.

01-25-2025, 11:54 AM	#1
StimpyV2 Scooby Newbie Member#: 388341 Join Date: Apr 2014 Location: Savannah, GA Vehicle: 2004 Wrx wagon White	Intermittent P0107 MAP circuit low EJ207 I’m currently having an issue with my V8 207 swap. It has operated fine for years, but now I have an issue. I get a P0107 code that actively disappears on acceleration, when I’m off the gas or idling the code comes back. During the times when the CEL is on the AFRs are very lean (from my AEM wideband) and runs very bad. I’ve replaced the front o2 sensor with a new denso, cleaned the MAF, and inspected for vacuum leaks. Should I be looking at the MAP sensor? TPS? I’m at a loss at the moment, I’m 500 miles my house so I don’t have access to my garage, but I do have logging abilities with romraider. If someone could help out I’d appreciate it. * Registered users of the site do not see these ads.

01-25-2025, 03:57 PM	#2
StimpyV2 Scooby Newbie Member#: 388341 Join Date: Apr 2014 Location: Savannah, GA Vehicle: 2004 Wrx wagon White	*** small update, I unplugged the MAP sensor and it idles very lean but becomes drivable at 1/3 the normal boost level and runs smoothly other than idle. If it is in fact the MAP sensor what my options as currently mine has the JDM one (PN: 22627aa260 denso) and these seem to be unavailable. Last edited by StimpyV2; 01-25-2025 at 04:58 PM.

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02-03-2025, 07:03 AM	#3
D-Rodman Scooby Specialist Member#: 110078 Join Date: Mar 2006 Location: Long Island N.Y. Vehicle: 02 Bugeye JDM STi OBP BLACK	I probably have one or two spares of those map sensors. Let me know if you can’t find one but you can probably source one on eBay. Sent from my iPhone using NASIOC

02-26-2025, 03:12 PM	#4
StimpyV2 Scooby Newbie Member#: 388341 Join Date: Apr 2014 Location: Savannah, GA Vehicle: 2004 Wrx wagon White	It was in fact the MAP. Replaced it with a one from eBay and it fixed my issues.