I’m considering buying a 2015 Toyota Aygo that’s reporting this DTC code: P1604 (Startability Malfunction) - Toyota P1604 Code: What It Means and How to Fix the Startability Malfunction - Daily Car Tips (From what I’ve found online, it means that sometime, the engine either failed to start, took to…

What Is The Normal Battery Voltage Off The Vehicle? When a car is off, the 12-volt battery should show a resting voltage typically between 12.4 and 12.6 volts. A fully charged and healthy lead-acid battery commonly reads around 12.6 to 12.8 volts. https://www.engine-codes.com/p1604_toyota.html Tes…

Is this a current code? Do any warning lights remain illuminated at idle? I meant 12.6 volts ignition off is fully charged Can you determine the battery’s age? Are the connections clean and tight?

[image] johnlambe: How would I know whether they had fixed the cause of it (if there is a problem to be fixed) Since I am in the US I have no idea how your vehicle used sales work. Some dealers offer a limited warranty. Some will let you take the vehicle to a shop to have it inspected.

Another question: are vehicles allowed to pass inspections (if required) with trouble codes?

The code seems to be very elusive and anywhere from a weak battery to a failing crank sensor, weak fuel pump or not holding pressure, weak ignition system or basically anything that can keep a vehicle from starting normally… You are rolling the dice buying this car, it could be the best used vehicl…

I have seen that fault hundreds of vehicles and never tried to repair one. If the battery was weak at one time, that fault will occur. Could be today, could have been 5 years ago. Nothing to obsess over. This seems to frighten people so this might be a buying opportunity.

I wouldn’t expect the Irish National Car Test to report this: It just tests for safety and emissions. It passed the test around July 2025.

[image] VOLVO-V70: Since I am in the US I have no idea how your vehicle used sales work. Some dealers offer a limited warranty. Some will let you take the vehicle to a shop to have it inspected. They offer a 3 month warranty on the engine and gearbox only, which seems common for older cars he…

[image] db4690: Is this a current code? It reported this when I read all DTC codes yesterday. I don’t know how long ago it could have been reported (or whether my OBD2 reader can report when codes were last cleared). [image] db4690: Do any warning lights remain illuminated at idle? I …

Toyota OBD Code P1604

Maintenance/Repairs

davesmopar March 23, 2026, 3:53am 14

Is it just me or does that battery look way to small for the vehicle, looks like the hold down comes out past the battery… Looks like the wrong group number… The lip for the hold down is on the wrong side of the battery…

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Toyota OBD Code P1604

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