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P1405 Turbo Pressure Sensor Fault in 2003 Toyota Previa D4D: Causes, Symptoms, and Repair Costs

Model: Toyota Previa 2003 D4D Fault Code: P1405 Posted: 2007-06-11 17:12

I have placed a deposit on a 2003 Toyota Previa D4D but have not yet completed the purchase. During a thorough inspection, we discovered a persistent fault code P1405 in the engine management system, indicating a 'Turbo Pressure Sensor Circuit Malfunction'. While driving, the vehicle exhibited poor performance below 4000 RPM. I was previously told that turbochargers typically become effective around 3000 RPM, but in this case, the turbo only engaged near 4000 RPM — significantly higher than expected. Due to heavy traffic at the time of testing, we were unable to conduct a proper road test on an open highway. The maximum speed achieved was approximately 40 mph with frequent stops. I am now wondering whether the P1405 fault code is directly related to this delayed turbo response. What exactly does P1405 mean? Is it a serious issue that could compromise engine performance or safety? If left unaddressed, will the vehicle continue to operate safely despite the persistent error code? Additionally, I would like to know the estimated cost for diagnosing and repairing this issue. Regards.

Related fault codes
P1405
Comments (9)
Anonymous 2007-06-12 09:01

I strongly recommend fixing the P1405 issue before finalizing any payment. The turbo should engage well below 4000 RPM — experiencing a delay at that speed is abnormal and indicates a potential sensor or system fault.

Anonymous 2007-06-12 09:15

A delayed turbo spool-up could be caused by a leak in the turbocharger system, leading to reduced pressure and inefficient operation. This may directly affect the accuracy of the pressure sensor readings and trigger P1405.

Anonymous 2007-06-15 02:29

Thank you for your input. I have decided to cancel the purchase. The dealer was unwilling to take the vehicle to a Toyota dealership for diagnosis or repair, even for basic investigation. Best regards.

Anonymous 2007-06-15 09:11

Good call — being proactive about vehicle issues is a smart consumer decision. Congratulations on making one of the more informed choices I've seen recently!

Anonymous 2007-10-14 17:50

Well said! That's exactly what responsible buyers should do.

Anonymous 2007-12-06 17:58

This is a 2003 Toyota Previa D4D. Could you please specify your country of residence? This may help in identifying region-specific repair procedures or parts availability.

Anonymous 2007-12-07 08:40

The forum has members from all over the world, so regional variations are common and should be considered when diagnosing older vehicles like this one.

Anonymous 2007-12-07 20:53

That's helpful. If I can determine the vehicle’s origin, I may be able to leverage my contacts at Toyota for accurate diagnostic guidance specific to that market.

Anonymous 2007-12-08 15:02

Moderator's privileges. Yes, you're absolutely right — I'm fully aware of how powerful a turbo can feel when properly functioning. This thread is now closed.