i can check the ecu connector but suspect the problem is not that simple,
Honestly, I suspect that there is a strong chance that the problem isn't that simple, too, but, if it was something that simple and you didn't check and went off buying new fuel pumps and sensors...well, we'd both feel bad about that.
as it really seems to be when the car is going up a bank when the engine is warm,
Well, I can't really think of anything that's particular about going up a bank that's different from normal accelerating, apart from the fact the nose is up and the tail is down. That brought to mind the idea that wires might not be in entirely the right place. Another possible idea is that you can't pick up fuel from the tank with the nose up:
- have you had the instantaneous fuel consumption displayed when this happens, and what does it show? (I'm actually not sure what I expect the displayed consumption to do when you put your foot on the accelerator and there is low pressure - it might be corrected for the failing pressure, or not).
i am pretty sure something is triggering the 02 lambda sensor and this is the cause of the power loss, it maybe the sensor its self but from reading it seems normally (on fords anyway) something else causes the 02 to trigger a dtc
There are several types of Oxygen sensor, and while I'm not sure, I'm expecting a heated wide band sensor (non-heated and narrow band are also possible). You can tell if it is a heated sensor, because they have more wires - at least on heavy duty wire, in addition to a couple of lower current ones.
If it is a heated sensor, I could see if the heater wires fell of (either the high current supply or the earth return which is probably a separate wire, but could be via the exhaust to ground somewhere) that might just lead to a loss of power, although I'd probably expect a warning light somewhere, but I don't really know. And, I'd certainly expect a fault code to be logged.
other than loss of turbo boost pressure is there anything else a common cause to trigger 02 dtc?
Wires falling off the sensor or the heater or a fault with the ECU on the input associated with that function (or the the output driving the heater). Or a short to either ground or some other potential on one of the O2 sensor wires. Probably, boost pressure low will cause a loss of power, but it shouldn't cause an O2 DTC.
my understanding of a lambda senor is it’s a final check of the cars mixture air/fuel and adjusts the ecu accordingly. but until i had this mondeo I only thought there was one fitted to each car but seems mondeo have more than 1 what is the purpose of the others?
I can only really tell you with certainty about the strategies used in petrol engines and some time ago, but I'll have a go.
The lambda sensor (O2 sensor) detects crap gigs at Greenwich...oh, sorry, its not that kind of O2 sensor. It detects excess oxygen in the output gas. It has to be a bit warm to work (say, 450C ideally, but you can probably get a usable output from 200C upwards). The usual reason to have more than one is that, either
- part of the exhaust after-treatment system affects lambda or
- that combustion is still affecting Lambda in the end gas
(given that something like a catalytic converter is doing much the same thing as combustion, you could argue that this is the same process just at different rates and temperatures...but that's not really relevant).
So, if you are expecting Lambda to still be changing along the exhaust, with two sensors you can check that it is and flag a fault if it isn't. I'd expect this to result in lights on the dash and fault codes rather than loss of power until you got into limp home, and that limp home should not occur before this has been going on for some time.
If, for example, you trying to do a dpf regen and the exhaust gas was still burning as it left the engine, you could broadly check that you were doing it right. there is also a pressure sensor across the DPF, to check for excess blocking of the DPF and if that reads high even after a regen has been attempted that will result in some kind of fault (fault code, plus, maybe, limp home). this could happen with, apart from the obvious reason, because the electrical connections to the pressure sensors are bad or even that the pipes are leaky.
But honestly Lorries were over taking me up some of the banks on the way to Plymouth on a recent trip but prior to the steep bank i had be cursing along at 80-90
..the cursing should only be done when the fault is present
ps i agree that the p2122-00 accelorator position sensor signal to low can cause problems i had this with a focus diesel my last car making it lumpy like a petrol car with a lead off but its never given this dtc again
If you feel that you are pressing the accelerator, but the system doesn't think that you are, this will obviously lead to a loss of power. Given that this fault code is showing not only a low accelerator input, but an accelerator input that should be impossible you may also expect fault code and other such as well as low power. But then, if that was the whole story, you expect this fault code to occur as many times as you have had the problem, which it didn't.