K12 Throttle Body... Fault Code P1122

Hi,

My 53 reg micra k12 has the engine management light on. The car sometimes stalls when slowing down at a junction. The idle is eratic and sometimes drops to about 300rpm and then shoots back up to 1200rpm.

After plugging in my code reader I get P1122. Throttle Position Sensor.

The light has come on a couple of times and the mechanic who turned it off last time mentioned a £500 part!!!

I'm sceptical as I paid £800 to have the timing chain replaced a few years ago in an attempt to fix my lumpy idle - it didn't work.

Also throttle bodies are about £50 on ebay!

Will an entirely new throttle body fix this? Or could it be a simpler, smaller part?

As you may be able to tell, I know nothing about cars. Computers yes, engines no! :(

Thanks.
 

chris810

Site Supporter
Hi,

My 53 reg micra k12 has the engine management light on. The car sometimes stalls when slowing down at a junction. The idle is eratic and sometimes drops to about 300rpm and then shoots back up to 1200rpm.

After plugging in my code reader I get P1122. Throttle Position Sensor.

The light has come on a couple of times and the mechanic who turned it off last time mentioned a £500 part!!!

I'm sceptical as I paid £800 to have the timing chain replaced a few years ago in an attempt to fix my lumpy idle - it didn't work.

Also throttle bodies are about £50 on ebay!

Will an entirely new throttle body fix this? Or could it be a simpler, smaller part?

As you may be able to tell, I know nothing about cars. Computers yes, engines no! :(

Thanks.
I had this or something similar and although no expert try what I did unplug the maf sensor on the top of the plastic cam cover and if it runs better it's the maf sensor if that's the problem then I have some
 
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