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1999 Toyota 4Runner Problems

Misfire and/or Check Engine Light Due to Failed Ignition Coil

for the Toyota 4Runner

On higher mileage vehicles, an engine misfire may develop and/or the Check Engine Light may illuminate due to a failed ignition coil. It is not uncommon to replace all the coils when the first one fails in order to prevent return trips to the repair shop.

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Hesitation or Misfire Due to Failed Mass Air Flow Sensor

for the Toyota 4Runner

When a mass air flow sensor problem occurs, resulting in a loss of power or hesitation on acceleration, the Check Engine Light will illuminate, perhaps indicating random cylinder misfire. The mass air flow sensor may respond to cleaning, but replacement of the sensor is best.

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Check Engine Light Due to Failed Charcoal Canister

for the Toyota 4Runner

The evaporative emission (EVAP) system may illuminate the vehicle's Check Engine Light due to intermittent failure of the charcoal canister purge control solenoid valve or canister failure. Upon failure of the charcoal canister, debris may circulate around the EVAP system causing other emission control problems.

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Check Engine Light Due to Failed Oxygen Sensor Heater

for the Toyota 4Runner

The heater circuit for the oxygen sensor tends to have a higher than normal failure rate. Failure of the oxygen sensor heater circuit will illuminate the Check Engine Light. The internal oxygen sensor heater cannot be repaired, the failed sensor should be replaced to correct this concern.

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Car Won't Start Due to Worn/Corroded Solenoid Contacts in Starter

for the Toyota 4Runner

If the car will not start, the most likely problem is worn or corroded solenoid contacts in the starter. Usually, these parts can be replaced without purchasing a new starter.

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