Toyota 4Runner owners have reported 39 problems related to catalytic convertor (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota 4Runner based on all problems reported for the 4Runner.
I own a 2003 Toyota 4 runner purchased in October of 2002. It emits a horrible rotten egg/sulphur smell into the cabin, windows up or down. Has given my passengers headaches and nausea. Tried the recommended gas upgrades, nothing works. This is a defect. Toyota should be made accountable.
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The following work order was given to me. Found dct # po420 ineffecient catalytic converter. Tested a/f sensor it was good, it measured 1. 8 ohms. Tested 02 sensor it measured 19. 0 ohms n@ 1800 degrees. Diagnosed switched grounds at e. C. U. E10 # 8 and # 17 . Removed and switched wires to the correct positions. Eraced code in ecu memory.
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all problems of the 1999 Toyota 4Runner
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Emission system problem, the catalytic converter is producing a gastric smell which is unbearable. Also, causes the driver to get sick while driving.
Consumer complained about a sulfur smell throughout the interior of the vehicle. Consumer took vehicle back to dealership, but dealer was unable to resolve the problem.