Octavia II 2.0 TDI CFHC – repeated throttle actuator failures + new P242C EGT sensor fault

Hi everyone,

I’m looking for some advice regarding a recurring problem with my Skoda Octavia.

Car details:

• Skoda Octavia II (1Z)

• Model/type: 1Z523C

• 2.0 TDI Common Rail

• Engine code: CFHC

• 103 kW / 140 hp

• Model year: 2013

I have been having recurring problems with the throttle valve/throttle actuator for several years.

The throttle valve has already been replaced three times, approximately at two-year intervals.

What concerns me now is that after the third replacement, the fault has returned after only about five months.

The current diagnostic scan shows the following faults:

P2100 – Throttle Actuator Control Motor Circuit/Open
Status: Active/Static

P2111 – Throttle Actuator Control System – Stuck Open
Status: Passive/Intermittent

P242C – Exhaust Gas Temperature Sensor Circuit Low, Bank 1 Sensor 3
Status: Passive/Intermittent

The P242C fault is new.

During the previous throttle valve failures, I only had faults related to the throttle system; there was no exhaust gas temperature sensor fault.

After having replaced the throttle valve three times, and with the latest one apparently developing a fault after only five months, I am starting to wonder whether the throttle valve itself is really the root cause.

Could there be an underlying problem causing repeated throttle actuator failures, for example a wiring/connector or electrical supply problem, an EGR/intake-related issue, excessive contamination, or something else specific to the CFHC engine?

I’m also interested to know whether anyone has seen P2100/P2111 together with P242C on this engine. Could the EGT sensor/circuit fault somehow be related to the recurring throttle problem, or are these most likely two independent issues?

Before replacing the throttle valve for a fourth time, I would really like to understand why this keeps happening.

Has anyone experienced something similar on a CFHC 2.0 TDI, or can suggest what should be checked next?

Thanks in advance for any technical advice or experience.

Best regards

Luca