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[Solved] Focus 2.0 TDCI 2006 - P1335 Error: EGR Temperature Sensor & Throttle Position Issues

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  • #1 17151149
    autoas
    Level 42  
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    Focus from 2006
    I have error P1335 described in the autocom "EGR exhaust gas recirculation temperature sensor - present"
    The error appears after the ignition is turned on, when I delete it on the working engine, it comes back only after turning off and on again ...
    In the forscana it is described as "P1335-62 - operation of the EGR system with the throttle position sensor in the idle position"
    EGRs are replaced and replaced only with the plug and the same, of course, adaptations made each time ...

    When fully disconnected, P0406 - EGR circuit high value appears

    Maybe you can tell me something !?
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    #2 17151177
    mod22
    Level 28  
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    Or maybe the throttle position sensor sucks and does not show what it should be on free, which results in a tilted EGR?
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  • #3 17151314
    autoas
    Level 42  
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    There is no damper there, only vacuum flaps ...
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    #4 17151388
    seat21
    Level 29  
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    egr potentiometer give voltage readings should be from 0.90 -1v to 4.5v
  • #5 17151431
    autoas
    Level 42  
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    And it is so .... with the ignition on, about 0.8 / 1.15V on slow, so about 2.5 / 2.9V
    If an error catches after turning the ignition on, the EGR is immobilized until it is deleted
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    #6 17151435
    moto-kord
    Level 28  
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    Hello, about the error, the workshop says:
    P1335 - Malfunction indicator lamp (MIL) on Exhaust gas recirculation (EGR) position sensor minimum operation at stop Crankshaft position sensor 1 circuit / open Check the following components:
    1 Hall / MRE sensor on the crankshaft
  • #7 17151455
    autoas
    Level 42  
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    I do not know what to check with these sensors ... the car starts and drives well ...
    Apparently it happened after replacing the glow plugs ...
    I have to write one more thing to you ... it turns out that he has the DPF cut out ... but it has been for a long time for 1.5 years and this problem has arisen now ....
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    #8 17151501
    robokop
    VIP Meritorious for electroda.pl  
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    And the mushroom is not controlled by a vacuum by chance?
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    #9 17151502
    moto-kord
    Level 28  
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    I also found this information:

    Engine warning light is on; Engine shake idling

    Symptom
    Engine warning light is on
    Fault code: P1335

    Engine quake
    Conditions at the moment the symptom appears:
    At idle
    Cause
    Faulty position sensor of the exhaust gas recirculation valve
    Solutions
    Turn on the ignition
    Exhaust gas recirculation valve:
    Check the control signal on pin 4
    Check the exhaust gas recirculation position sensor signal at terminal 6
    Note: Use an oscilloscope
    Expected values:
    Exhaust gas recirculation valve position sensor: 1V

    Connect the diagnostic tool
    Activate the exhaust gas recirculation valve
    Exhaust gas recirculation valve position sensor:
    If the value does not change
    Replace exhaust gas recirculation valve
    Initialize the exhaust gas recirculation valve
    Legal disclaimer clause
    The SmartCASE information provided by HaynesPro is prepared by suitably qualified automotive specialists
  • #10 17151537
    autoas
    Level 42  
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    EGR is completely electric .....
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    #11 17151827
    seat21
    Level 29  
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    it remains to throw in the ori software and try to adapt again or switch it off, since dpf is no longer there
  • #12 18277015
    autoas
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    I replaced the engine controller ... and it helped
  • #13 18277017
    autoas
    Level 42  
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    I replaced the engine controller ... and it helped

    Added after 31 [seconds]:

    Same as above ...
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Topic summary

✨ The discussion revolves around a 2006 Ford Focus experiencing a P1335 error related to the EGR (Exhaust Gas Recirculation) temperature sensor and throttle position issues. The error reappears after ignition is turned on, despite replacing the EGR and performing adaptations. Participants suggest checking the throttle position sensor, as it may not be providing accurate readings, which could affect EGR operation. Voltage readings for the EGR potentiometer are discussed, with expected values between 0.90V and 4.5V. Additional troubleshooting steps include checking the crankshaft position sensor and considering the impact of a previously removed DPF (Diesel Particulate Filter). Some users recommend reprogramming the engine controller as a potential solution.
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FAQ

TL;DR: Focus 2.0 TDCi P1335 often points to the EGR position sensor; expect about 1.0 V at rest—"Faulty position sensor of the exhaust gas recirculation valve." Test pins 4/6 with a scope and command movement via a scan tool. [Elektroda, moto-kord, post #17151502]

Why it matters: This FAQ helps Ford Focus Mk2 2.0 TDCi owners and techs quickly diagnose and resolve stubborn P1335 faults without guesswork.

Quick Facts

What does code P1335 mean on a Ford Focus 2.0 TDCi?

P1335 here points to an EGR position sensor fault with idle symptoms. Guidance: check pin 4 control, pin 6 position, and expect about 1.0 V at rest. If commanded movement shows no sensor change, replace and initialize the EGR. "Faulty position sensor of the exhaust gas recirculation valve." [Elektroda, moto-kord, post #17151502]

Why does P1335 return after every key cycle?

In this case, the fault reappeared immediately after turning the ignition off and on again. Clearing the code with the engine running held only until the next restart. This pattern indicates the condition is detected at key-on. [Elektroda, autoas, post #17151149]

What voltage should I see on the EGR potentiometer?

Expect approximately 0.90–1.0 V closed and up to around 4.5 V fully open. "EGR potentiometer give voltage readings should be from 0.90–1 V to 4.5 V." Use live data or a multimeter for a quick check. [Elektroda, seat21, post #17151388]

How do I test the EGR control and position signals with a scope?

Use this quick 3-step check:
  1. Turn ignition on; back-probe pin 4 (control) and pin 6 (position).
  2. Expect about 1.0 V at rest on the position signal.
  3. Command EGR movement with a diagnostic tool; if the position value does not change, replace and initialize EGR. [Elektroda, moto-kord, post #17151502]

Is the EGR vacuum-controlled or electric on this engine?

On the reported Focus 2.0 TDCi, the EGR valve is fully electric. No vacuum actuator controlled the EGR in that case. [Elektroda, autoas, post #17151537]

Could a throttle position sensor (TPS) be the cause here?

The car discussed had no throttle plate; only vacuum flaps were present. That makes a TPS fault unlikely in that specific case. Always verify your vehicle’s hardware before testing. [Elektroda, autoas, post #17151314]

What happens if I unplug the EGR to troubleshoot?

Unplugging the EGR produced code P0406 (EGR circuit high). That confirms the ECU detects an EGR electrical fault when disconnected. It does not diagnose the original P1335 root cause. [Elektroda, autoas, post #17151149]

Why does the EGR stop moving once the fault sets?

The author noted that once the error sets at ignition-on, the ECU immobilizes the EGR until you clear the code. After clearing on a running engine, it worked until the next key cycle. [Elektroda, autoas, post #17151431]

Can the crankshaft position sensor trigger P1335?

One workshop description mapped P1335 to a Crankshaft Position Sensor 1 circuit/open. It advised checking the Hall/MRE sensor on the crankshaft as an alternate path. [Elektroda, moto-kord, post #17151435]

Does a DPF delete or tune affect P1335 troubleshooting?

With the DPF already removed in this case, one suggestion was to reload original software and re-adapt, or switch EGR off in software as configured. Software state can influence EGR strategies. [Elektroda, seat21, post #17151827]

What live values were seen on this Focus?

Reported readings: about 0.8–1.15 V with ignition on, and about 2.5–2.9 V at idle. Those sit within a typical 0.90–4.5 V sweep, yet the code persisted. [Elektroda, autoas, post #17151431]

What ultimately fixed the P1335 in the thread?

Replacing the engine controller (ECU) resolved the problem in the reported case. After ECU replacement, the P1335 fault did not return. [Elektroda, autoas, post #18277015]

My car runs fine—can P1335 still appear?

Yes. The author stated the car started and drove well despite the warning light. The fault arose after glow plug replacement and with a previously removed DPF. [Elektroda, autoas, post #17151455]

Why do Autocom and FORScan describe P1335 differently?

Autocom labeled it “EGR temperature sensor—present.” FORScan showed “P1335-62—operation of the EGR system with the throttle position sensor in the idle position.” Text differs, but both reference the EGR system. [Elektroda, autoas, post #17151149]
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