The other night, my wife started our R53 and she said it was making a racket. I can get the car to start and it seems to run fine with the RPM's up. However, when the RPM's drop the car stalls. Also, if I put it into gear and try to move it, it stalls.

It shows a P0171 (system too lean) confirmed code and also a P0172 (system too rich) pending code. I could definitely smell changes in the exhaust. Is there a flowchart to diagnose the cause of the problem?

I have INPA along with a regular OBDII scanner. I'm trying to figure out where to download ISTA as well.

 

New t-map sensor fixed this for me. I had the same issue

i should add. If u go this route, go w stock sensor. Many issues reported with aftermarket…

one more add, what do your fuel trims look like in inpa?

 

Thanks for the tip. I got ISTA installed. It pointed to a bad pre cat O2 sensor. As I was running the test, I noticed that the car ran mostly fine until warmed up. Once it got close to operating temp, the car would stall unless I kept the RPM up.

I just picked up an O2 sensor, so we'll see if that solves the issue.

 

Good to hear let me know how it turns out

 

I got the new O2 sensor in, but it is still acting the same. I'm about to hit 100K, so I don't feel too bad about replacing it since it's recommended.

I ran a new test. I am now getting an error on the t-map sensor:I took out the tmap and it looks clean. All the connections and wires look fine, but need to remove the air box and have a closer look when it's light out.

 

R53 has tmap. R50 does not.

tmap is located in front of engine on the manifold

attached a pic

 

Try cleaning the plug and check the connector pins and all.

I had to replace mine…dollars to donuts, sir

 

I think I was looking at the wrong map sensor (the one about the thermostat). The t-map is in front of the engine, correct?

Replacement is likely, just can't get OEM on a holiday weekend...

 

Go to rockauto thats where i got myn 10k miles on it no problems

 

yes sir, front of engine. Use realoem.com to be sure u get the right part

i just got one from fcpeuro

 

Alternative site: https://mini.7zap.com/en/mini/r53/cooper+s/

 

I called Cincinnati Mini, hoping to find a T-Map sensor in stock locally. I'm constantly disappointed with this dealer. Nothing in stock and 10-13 days delivery for $190 something. This dealer never has anything in stock and marks parts up 30% over list. A couple of online Mini parts dealers list the same part for about $112, but I was unsure of the delivery time. fcpEuro and ECS had long lead times also. It's amazing that these are hard to come by for a seemingly frequent problem.

Fortunately @WayMotorWorks keeps them on hand for a fair price. I added a Cravenspeed dipstick to replace my broken one to the order. I'm hoping the sensor comes in soon as it's my wife's daily driver.

 

It was the T-Map sensor!!!!

Unfortunately, the new replacement hadn't arrived yet. However, an R53 landed in my local U-pull-and-pay yesterday. Grabbed it, cleaned it, installed it and everything is good with the world again!

 

Nice, good work!