P2199
Intake Air Temperature Sensor 1 / 2 Correlation
- Severity
- Medium
- Driving
- Drivable — book it in
The two intake air temperature sensors disagree. Two are fitted so their readings can be compared - one before the turbocharger or intercooler and one after, on many engines - and this code says the difference between them is not plausible. On a turbocharged engine, that can mean the intercooler is not doing its job rather than that a sensor has failed.
Possible causes
- CommonFailed or drifting intake air temperature sensor
- CommonCorroded connector or damaged wiring
- CommonBlocked or damaged intercooler, so the air genuinely is not being cooled
- PossibleIntake leak between the two sensors
- PossibleSensor contaminated with oil from the crankcase breather
- PossibleLoss of reference voltage or earth
What you might notice
- Reduced power or limp mode
- Worse fuel economy
- Black smoke on a diesel
- Poor performance in hot weather
- Check engine light on
What to check, in order
- Compare both sensors on a vehicle that has stood overnight. Both should read close to ambient and close to each other - a difference on a cold engine identifies the drifting sensor.
- Check the intercooler and its ducting. On a turbocharged engine a blocked or leaking intercooler makes the two sensors genuinely disagree, and both are telling the truth.
- Inspect both connectors for corrosion and oil contamination.
- Check the reference voltage and earth at each sensor.
- Check for intake leaks between the two sensor positions.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel and air metering
P2100P2101P2102P2103P2104P2105P2106P2107P2108P2109P2110P2111P2112P2113P2114P2115P2116P2117P2118P2119P2120P2121P2122P2123P2124P2125P2126P2127P2128P2129P2130P2131P2132P2133P2134P2135P2136P2137P2138P2139P2140P2141P2142P2143P2144P2145P2146P2147P2148P2149P2150P2151P2152P2153P2154P2155P2156P2157P2158P2159P2160P2161P2162P2163P2164P2165P2166P2167P2168P2169P2170P2171P2172P2173P2174P2175P2176P2177P2178P2179P2180P2181P2182P2183P2184P2185P2186P2187P2188P2189P2190P2191P2192P2193P2194P2195P2196P2197P2198P2199