P0171 CODE SYSTEM TOO LEAN BANK 1

Asked by Apr 13, 2017 at 03:25 PM about the 2010 Vauxhall Corsa 1.4 SXi (a/c) 5d

Question type: Maintenance & repair

Hi, I recently had the Engine Management Light come on & when I put the code tester on It code P0171 came up showing ' System Too Lean ' BANK 1
So, apart from putting an additive In which was a fuel system cleaner, I've also checked for air leaks under the bonnet which I couldn't hear.
Therefore, as I don't really want to pay out unduly for MAP, MAF, LAMBDA SENSORS, could It be a dirty or clogged Injector as when my Son fires up 1st thing In the morning, It doesn't start at the flick of a key?
I'd be so grateful for any help at all & also wondered whether It was a common problem with these models?
Thanks so much In advance
Regards
Darren

5 Answers

1,620

Hi Darren, this is a tricky one as the fault code you're getting could point to any number of items. I'd go back and double check all the hoses for leaks as it's not always the case that you can hear a leak. Examine each hose carefully for splits/holes, especially underneath where they're not immediately apparent. My gut feeling is that it's most likely to be a MAP sensor... I think these are about £60-70, and I'd recommend getting a quality part such as a Bosch item as some of the less well known makes don't have a brilliant reputation. If it's not this then I think your next port of call would be to look at the lambda sensors. Otherwise you may have to take it to a garage for a more accurate diagnosis... while this will obviously cost more it could save money in the long run rather than replacing parts by guess work. Hope this helps, and do let us know how you get on and what cures the fault as this could well be of use to other Corsa owners. Cheers, Bob

2 people found this helpful.

Hi i have the same problem and replaced the MAP sensor, Air Filter and had the inlet mamifold taken off and resealed. The throttle body was voked up so that was cleaned. Car was a dream for 1.5 days mow the light is on plus the traction and service light.

Possible pcv valve on rocker cover,, the membrain tends to fail eventually,, not IF but when it fails rocker cover will need replaced as the membrain is fused onto the cover. Check the disk on top of the engine near to oil filler cap,, there is a small hole that’s to atop the membrain sticking..( becoming air locked as it moves ) 5dt it’s failed air will be sucked into this hole,,, it should not be drawing air what so ever,,, hope this helps.

Just found out that It Is the FUEL CANISTER PURGE VALVE which regulates the oxygen Intake. In other words, not enough oxygen was entering the mixture, so try that If I were you, maybe that's what will come up on the Tech 2 tester as well?

Hi Had this same fault on a Tigra and tried everything. Turned out to be a faulty brake servo leaking air into the manufold through the vacuum pipe. If you also think the brakes can be a bit sharper worth looking at that.

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