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My 2001 Kia rio threw a P1166 code

This code shows up as LAMBDA CON.AT L/R LIMIT B1
can any body tell me what that means

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Typically, that there's an issue with the Idle Air Control Valve. They're known for seizing/sticking on Kias.

It could also be the Mass Air Flow Sensor. They're known to be a little flaky on Kias. If someone confirms it's the MAF sensor, replace the wiring harness with it (trust me, worth it, as they're known issues too).

Another possibility is the Throttle Body Position Sensor. If it's hooped, replace it and the gasket. Yes, you guessed it, they're ALSO a known problem with Kias, particularly the Rios.

Yet another known problem is that some of these Rios left the factory with the breather and pcv tube hooked up into each other's connections. See if they're swapped and swap them back if neccessary.

Another factory issue is the timing sprocket set. Some Rios left the factory with one or both installed backwards (despite the very clear labelling stamped into the sprocket), which allows the belt to skip a tooth, and you end up with valve timing issues, and eventual cylinder head problems.

Bottom line is have someone look for these known issues first, because they're all fairly common, and it's usually some mixture of any number of them. Have whoever's doing the work on it check the camshaft seal and the intake air temperature sensor while they're in there- yup, more known issues with Rios- as well as the plugs (prone to carbon buildup in these engines) and do a pinout test on the ECM (prone to failure in the air/fuel metering capacity particularly).

Posted on Jul 10, 2009

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