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Your oxygen sensor is bad, or the connection may be corroded.

Luckily this is a part you can replace yourself. It unscrews from the exhaust manifold and is a relatively easy fix. I would buy it online, not at a dealer.

Good luck!

Seems to contradict page 243 of 1990 Jaguar Factory Drivers Handbook , under Engine Diagnostics Checks: FAULT CODE 26 is described as "air leak" and FUNCTION descriptor states "Look for poor feedback control in lean direction". ??????

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