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Grande Punto 2007: Error P0089 1.3 Multijet, Check Light On - Replaced Sensors & Filter

golabek008 13419 12
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  • #1 16968725
    golabek008
    Level 9  
    Welcome to the point, such an error pops up and the check starts. Replaced sensors on the rail and the regulator. The fuel filter is new and nothing. What to look for
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  • #2 16968798
    żałosna udręka
    Level 34  
    Injections on transfer.
  • #3 16968829
    golabek008
    Level 9  
    I will check and let you know.

    Added after 38 [minutes]:

    There are almost no differences, so what next?

    Added after 42 [minutes]:

    I would like to add that the error pops up under load, i.e. at a standstill it normally screws up and walks, goes on the road and bangs the error almost immediately. And the error description is the performance of pressure regulator 1.
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  • #4 16969585
    rob4028
    Level 25  
    Look into the fuel tank, maybe a blocked sieve?
  • #5 16969653
    ozon79
    Level 13  
    The injectors are most likely not holding pressure. During acceleration, the pressure on the rail drops, which informs the ECU and we have an error.
  • #6 16970337
    golabek008
    Level 9  
    Can it be confirmed somehow at home or only injections on the machine? The pressure on the rail is about 300 bar at idle. Not too much?
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  • #7 16970457
    ozon79
    Level 13  
    Do the injector overflow test. He will definitely say something, it does not take much time.
    I'm betting an injector or two is not holding pressure.
  • #8 16970475
    golabek008
    Level 9  
    I wrote before I did and there are hardly any differences between the injectors

    Added after 7 [hours] 6 [minutes]:

    Today I pulled the pump out of the tank, it was a little bit full, I cleaned it and no reaction, the same thing. But when I had it pulled out, I connected it for a short time and when it is full, it pumps normally, and when it is pumped out, it is not possible to pour fuel into it, should it be? I know that the fuel is also poured there from the return. Speaking of transfers, is it some value, how much should you transfer? Somewhere I read that 150 ml in 4 minutes at idle for all cylinders.
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  • #9 16971571
    rob4028
    Level 25  
    Check the fuel filter again .... please ..
  • #10 16971597
    golabek008
    Level 9  
    The filter is ok.
  • #11 16973498
    golabek008
    Level 9  
    It seems to me that the injectors need to be replaced. In the overflow test, it happened to pour 20ml for injection within 30 seconds, so the diagnosis is probably simple?
  • #12 16973509
    ozon79
    Level 13  
    Yes. They don't hold pressure.
  • #13 16985089
    golabek008
    Level 9  
    I close the topic. Injector fault.
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Topic summary

✨ The discussion revolves around a 2007 Grande Punto 1.3 Multijet experiencing error code P0089, indicating a performance issue with the pressure regulator. The user has replaced the fuel sensors and filter but continues to encounter the error, particularly under load. Responses suggest checking for a blocked fuel tank sieve, injector pressure retention, and conducting an injector overflow test. The user confirms low injector performance, leading to the conclusion that the injectors likely need replacement due to their inability to hold pressure.
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FAQ

TL;DR: For a Grande Punto 2007 1.3 Multijet with P0089, an injector overflow of 20 ml in 30 seconds flagged leaking injectors; “It seems to me that the injectors need to be replaced.” [Elektroda, golabek008, post #16973498] Why it matters: This FAQ helps owners diagnose P0089 (pressure regulator performance) that appears under load and decide next steps efficiently.

Quick facts:

Quick Facts

What does error P0089 mean on the 1.3 Multijet?

In this case, P0089 referred to “pressure regulator 1 performance.” The check light appeared mainly during driving, not at idle. That pattern points to a fuel-pressure control problem manifesting under load. The thread’s diagnosis focused beyond sensors once load-specific symptoms were clear. [Elektroda, golabek008, post #16968829]

Why does the check light trigger only under load?

During acceleration, rail pressure can drop if injectors leak or can’t hold pressure. The ECU detects the drop and logs a regulator performance fault. One contributor explained that injectors not holding pressure cause rail pressure to fall when accelerating. [Elektroda, ozon79, post #16969653]

Is 300 bar at idle a concern for this fault?

The poster observed about 300 bar at idle while chasing P0089. The engine idled and revved normally when stationary. Symptoms appeared on the road, so attention shifted to load-related fuel pressure losses rather than idle readings. [Elektroda, golabek008, post #16970337]

How do I confirm bad injectors at home (no test bench)?

Run an injector overflow (return) test at idle. Collect each injector’s return in equal containers for a set time. Compare volumes to spot excess return. As one member advised: “Do the injector overflow test.” This quick check can reveal injectors that don’t hold pressure. [Elektroda, ozon79, post #16970457]

What overflow result from this thread indicated a leaking injector?

One injector returned about 20 ml in 30 seconds at idle. That level of return coincided with load-induced pressure loss and P0089. The finding led the poster to conclude injectors required replacement. [Elektroda, golabek008, post #16973498]

Could a clogged in-tank sieve cause similar symptoms?

Yes. A blocked pick-up sieve can restrict supply, starving the high-pressure system under load. A contributor suggested inspecting the tank for a blocked sieve when diagnosing P0089-type rail-pressure issues. [Elektroda, rob4028, post #16969585]

Should I re-check the fuel filter even if it’s new?

Yes. A member urged re-checking the fuel filter during diagnosis. New filters can be incorrect, damaged, or improperly installed, and restrictions here can mimic regulator faults. Re-verify flow direction and seals when troubleshooting. [Elektroda, rob4028, post #16971571]

My overflow volumes look similar—can injectors still be bad?

Similar returns don’t guarantee healthy injectors. The poster initially saw hardly any differences yet still had load faults. Subsequent testing pointed back to injectors despite the near-equal returns at first glance. [Elektroda, golabek008, post #16970475]

What did the in-tank pump behavior show during testing?

With the module out, it pumped normally when the canister was full, but not once pumped out. The poster noted fuel also feeds back via return, highlighting how low-supply states can complicate diagnosis. [Elektroda, golabek008, post #16970475]

I replaced the rail sensor and regulator, plus a new fuel filter. Why does P0089 persist?

The thread author did the same with no improvement. Load conditions still triggered P0089. That pushed the diagnosis toward injectors and supply restrictions rather than just sensors or the regulator hardware. [Elektroda, golabek008, post #16968725]

What was the final fix reported in this thread?

The author closed the topic confirming an injector fault. Replacing or repairing the faulty injectors resolved the P0089 and load-related check light. [Elektroda, golabek008, post #16985089]

What does “injectors aren’t holding pressure” actually imply?

It means internal leakage through the injector raises return flow, dropping rail pressure under demand. As one expert summarized: “They don’t hold pressure.” This condition triggers the ECU to flag a pressure regulation performance issue. [Elektroda, ozon79, post #16973509]

How do I perform the injector overflow test (3 steps)?

  1. Warm the engine and fit clear hoses and measuring vials to each injector return.
  2. Idle for a fixed interval, then stop and compare volumes across cylinders.
  3. Mark any injector with notably higher return for further bench testing or replacement. [Elektroda, ozon79, post #16970457]

Can cleaning the tank pump or module restore normal operation?

Cleaning helped reveal behavior but did not fix the fault here. Even after cleaning, the same load-triggered error persisted until injectors were addressed. Use pump inspection to rule in/out supply issues, then proceed. [Elektroda, golabek008, post #16970475]

Does a new filter guarantee fuel delivery is fine?

No. The poster confirmed the new filter was okay, yet the issue continued. This reinforces checking injectors and rail pressure under load, not just replacing service parts. [Elektroda, golabek008, post #16971597]
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