20 minutes ago, TomsFocus said:

HDC is heater duty cycle.

Thanks Tom, that Code is not for the Heater Circuit, I'm trying to establish if it is a Wideband Sensor. If it is then the Code is for the internal workings of the Sensor.

Any Idea what the B stands for?

2 minutes ago, James pritchard said:

I wasn’t trying to tell what they meant mate do apologise if it came across like that.

Don't worry, I did not take it like that and Tom has answered the question. 

Do you remember if the Sensor had 6 Wires?

Yes it did mate 

2 minutes ago, James pritchard said:

Yes it did mate 

That means it is a Wideband Sensor and as per my other answer that Code is not for the Heater Circuit to the Sensor, it relates to the Internal workings of the Sensor but that could still be a Wiring or PCM problem.

Given that Tom has deciphered what the PID means, the Duty Cycle of the Heater Circuits will stabilise to an extent when the Engine is up to Temperature, so the readings that you are monitoring may well be ok.

Even if the bank 1 freezes and doesn’t move mate? I’ll get the wiring checked from the plug to pcm

Thanks for the info buddy much appreciated 

12 minutes ago, James pritchard said:

Even if the bank 1 freezes and doesn’t move mate? I’ll get the wiring checked from the plug to pcm

I don't know why that one is completely freezing, that may be happening when the Fault Code is logged or it may be normal in steady driving conditions, I'm not sure.

If there was a fault with the Heater Circuit I would expect a different Fault Code.

Ok mate. I’ll go back to an auto electrician and see what they find 

Here is the official Ford description

DTC P2237 - O2 SENSOR POSITIVE CURRENT CONTROL CIRCUIT/OPEN (BANK 1 SENSOR 1) P2237 - O2 SENSOR POSITIVE CURRENT CONTROL CIRCUIT/OPEN (BANK 1 SENSOR 1) Description: This DTC sets when a concern is detected with the circuit used to determine the oxygen content in the exhaust gas. Possible Causes: UO2SPC11 circuit open Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11)

I’ve got it booked in to an auto electrician on Boxing Day for few days let him try work his magic 

51 minutes ago, James pritchard said:

I’ve got it booked in to an auto electrician on Boxing Day

That's very generous of you. Paying double time and a day off in lieu 🤣

He said he’s back normal Boxing Day and I’m off the whole week so works for me. Hopefully he can find the issue tbh 🤞🏻

Tbh I don’t mind paying a little extra over the Xmas break if it gets fixed mate 

Self employed trades can't afford to be taking Bank Holidays off nowadays.

On 12/15/2024 at 10:53 AM, TomsFocus said:

 

Nothing cheap unfortunately.

This does seem to be an error with the sensor return readings for the PCM, rather than the heater circuit.

Next step should be checking the wiring from the sensor plug to the PCM plug, but I don't know how easy it is to access the PCM on a Mk3.5 and is probably best left to an auto-electrician.  If the wiring checks out ok, you could have the PCM tested while there is access to it, but that probably won't be done for free.

On the petrol's around the same age, there is some procedure that Ford often have to carry out after a lambda change to prevent the fault coming back, but unfortunately we only get second hand information from the customer, so I'm still not sure exactly what's being done and whether Forscan can do it.  For a free check, it would be worth checking under service procedures to see whether there's any sort of reset for lambda learned values, or words to that effect.

Hi mate cars been to an auto electrician and he’s tested the wiring all way back to PCM from plug and everything seems fine. He’s checking the ground wire tomorrow morning but if that checks out then I’m at a loss. I found on Google that the downstream sensor can also cause p2237 code as it shares the same heater circuit 

1 hour ago, James pritchard said:

Hi mate cars been to an auto electrician and he’s tested the wiring all way back to PCM from plug and everything seems fine. He’s checking the ground wire tomorrow morning but if that checks out then I’m at a loss. I found on Google that the downstream sensor can also cause p2237 code as it shares the same heater circuit 

As I said previously, that Fault Code is not for the O2 Sensors Heating Circuit.

@Tizer hi mate already changed bank one sensor one and the problem still persists I did Google it and the code on getting in the downstream sensor can also cause P2237

On 12/15/2024 at 9:32 PM, Tizer said:

Here is the official Ford description

DTC P2237 - O2 SENSOR POSITIVE CURRENT CONTROL CIRCUIT/OPEN (BANK 1 SENSOR 1) P2237 - O2 SENSOR POSITIVE CURRENT CONTROL CIRCUIT/OPEN (BANK 1 SENSOR 1) Description: This DTC sets when a concern is detected with the circuit used to determine the oxygen content in the exhaust gas. Possible Causes: UO2SPC11 circuit open Damaged universal heated oxygen sensor bank 1, sensor 1 (HO2S11)

The above is the official Ford description of what that Code means. 

32 minutes ago, Tizer said:

The above is the official Ford description of what that Code means. 

Yeah just re-read it mate..changed bank one with genuine Ford and even a garage put another in to try still fault there. Losing my will to live with it tbh