If you google that you find some interesting info. I always thought when they died they threw a code, otherwise they were OK. Sounds like they will degrade with age and can affect fuel economy and emissions but still not be bad enough to throw a code. Bosch recommends replacing at 100,000 miles. Of course, they make them! Lookslike it's about a hundo to do all four.
quote:Originally posted by NewBlue:
If you google that you find some interesting info. I always thought when they died they threw a code, otherwise they were OK. Sounds like they will degrade with age and can affect fuel economy and emissions but still not be bad enough to throw a code. Bosch recommends replacing at 100,000 miles. Of course, they make them! Lookslike it's about a hundo to do all four.
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