Thank you Dan for this useful information concerning my mk1 Toyota Yaris P1229 fault code. I serviced the car myself changed Fuel, air and oil filters cleaned Egr Valve and throttle body and gunk around the exhaust manifold. I understand the Pcv valve needs a service but I have not a clue were to find it on this engine. Any information regarding this would be very useful.
Thank you
Andy United Kingdom
P1229 on Toyota usually means "Fuel System Over Pressure" is common on these - usually it means that your pressure regulator on the fuel rail has gone bad. A very common issue, shouldn't cost too much to replace the regulator.
I'd first repair this, reset codes and see how it goes - usually this is all that you need.
P0340 usually means "Camshaft Position Sensor Circuit Malfunction" means it's not the sensor - it's the circuit or the ECU. The ECU on these 1.4L engines is known to have some glitches - If it's supplying constant voltage to the injectors even when the car's off - it's bad.
If solving the first one and clearing codes doesn't help - try the obvious things like checking the air filter, cleaning the EGR valve and replacing the PCV system (also common maintenance things you should do on a 1.4 D4D)
Also, I've researched this engine online and found that people suggest that if you have oil consumption you should immediately check the turbocharger cause it and the PCV are usually the ones to cause this issue.
Also check that your engine has gotten all of the required maintenance.
I think the P1229 code triggered a P0340 code because after cancelling the p0340 code it did not return after the car stalled again.
On most Toyota engines there's a line going between the valve cover and the intake manifold - the PCV valve is usually screwed into the valve cover inside of that line.
In regards to your previous post, I still really recommend replacing the fuel pressure regulator - it's super common on these engines and if the car detected it's experiencing a malfunction it's best to replace that part, It's a small plastic sensor screwed onto the end of the fuel rail.
Hi Dan, In regards to your recent answer to my question in your last post: I understand why you believe the problem to be my "Fuel pressure regulator! " on my Yaris 2005 d4d but having done some research online myself regarding this part I found a bad fuel pressure regulator problem seems to effect the starting of the engine i.e bad starting issues. My car starts first time every time even when cold, the problem I get is a hunting idle and cutting out while driving, is it possibly the Fuel pressure Sensor and not the regulator causing this issue.
Best Regards
Andy United kingdom