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AWD - P2188 System too rich at Idle Bank 1

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P2188 System too rich at Idle Bank 1

My 2004 XC70's engine has been fault-free for the 2 years since I bought it. It's the 5-cyl B5254 T2.

After filling fuel tank today, upon restart it threw a P2188

"System too rich at Idle Bank 1".

I noticed right away that the idle was choppy, almost stalling, then racing, then settling down. Driving home, the choppiness continued at stop lights. It's almost as if the throttle is getting whipsawed. My initial guess was contaminated fuel, but since the problem has continued all day, I'm doubtful.

What does the "too rich" error suggest? What should I do to pin down cause?





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P2188 System too rich at Idle Bank 1

Neglected to mention, car has 120,000 mi. (190,000 km).

Too much fuel injection (flooding) suggests the MAF sensor signaling more airflow than there actually is.
I decided to clean the MAF sensor, using a MAF Sensor cleaner spray.

This has smoothed out the idle, although it's a bit high (850 RPM) in neutral.





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P2188 System too rich at Idle Bank 1

You might want to clean the ETM, electronic throttle body. Some of these cars also suffer from the main computer pins been out of alignment. Take it to a Volvo specialist to reset the computers.

The hose from the PCV that goes up next to the oil fill cap tents to brake and needs replacing.





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